10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number: 001-36557

ADVANCED DRAINAGE SYSTEMS, INC.

(Exact name of registrant as specified in its charter)

Delaware	51-0105665
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

4640 Trueman Boulevard, Hilliard, Ohio 43026

(Address of Principal Executive Offices, Including Zip Code)

(614) 658-0050

(Registrant’s Telephone Number, Including Area Code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.01 par value per share	WMS	New York Stock Exchange

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

Large Accelerated Filer	☒	Accelerated Filer	☐
Non-Accelerated Filer	☐	Smaller Reporting Company	☐
Emerging Growth Company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

As of October 29, 2021, the registrant had 71,241,663 shares of common stock outstanding. The shares of common stock trade on the New York Stock Exchange under the ticker symbol “WMS.” In addition, as of October 29, 2021, 315,017 shares of unvested restricted common stock were outstanding and 16,869,523 shares of ESOP, preferred stock, convertible into 12,976,037 shares of common stock, were outstanding. As of October 29, 2021, 84,532,717 shares of common stock were outstanding, inclusive of outstanding shares of unvested restricted common stock and on an as-converted basis with respect to the outstanding shares of ESOP preferred stock.

TABLE OF CONTENTS

PART I. FINANCIAL INFORMATION
Item 1.	Condensed Consolidated Financial Statements (Unaudited)	Page
	Condensed Consolidated Balance Sheets as of September 30, 2021 and March 31, 2021	3
	Condensed Consolidated Statements of Operations for the three and six months ended September 30, 2021 and 2020	4
	Condensed Consolidated Statements of Comprehensive Income for the three and six months ended September 30, 2021 and 2020	5
	Condensed Consolidated Statements of Cash Flows for the six months ended September 30, 2021 and 2020	6
	Condensed Consolidated Statements of Stockholders’ Equity and Mezzanine Equity for the three and six months ended September 30, 2021 and 2020	7
	Notes to the Condensed Consolidated Financial Statements	9
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	19
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	31
Item 4.	Controls and Procedures	31
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	32
Item 1A.	Risk Factors	32
Item 2.	Unregistered Sale of Equity Securities and Use of Proceeds	32
Item 3.	Defaults Upon Senior Securities	32
Item 4.	Mine Safety Disclosures	32
Item 5.	Other Information	32
Item 6.	Exhibits	33
Signatures		34

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PART I. FINANCIAL INFORMATION

ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited) (In thousands, except par value)

	September 30, 2021		March 31, 2021
ASSETS
Current assets:
Cash	$	14,005	$	195,009
Receivables (less allowance for doubtful accounts of $8,068 and $5,323, respectively)	361,466		236,191
Inventories	425,244		300,961
Other current assets	16,858		10,817
Total current assets	817,573		742,978
Property, plant and equipment, net	544,187		504,275
Other assets:
Goodwill	598,976		599,072
Intangible assets, net	450,925		482,016
Other assets	94,963		85,491
Total assets	$	2,506,624	$	2,413,832
LIABILITIES, MEZZANINE EQUITY AND STOCKHOLDERS’ EQUITY
Current liabilities:
Current maturities of debt obligations	$	7,000	$	7,000
Current maturities of finance lease obligations	17,467		19,318
Accounts payable	257,576		171,098
Other accrued liabilities	129,818		116,151
Accrued income taxes	1,978		4,703
Total current liabilities	413,839		318,270
Long-term debt obligations (less unamortized debt issuance costs of $1,839 and $2,030,  respectively)	901,511		782,220
Long-term finance lease obligations	35,149		32,964
Deferred tax liabilities	163,238		162,185
Other liabilities	61,366		54,767
Total liabilities	1,575,103		1,350,406
Commitments and contingencies (see Note 9)
Mezzanine equity:
Redeemable convertible preferred stock: $0.01 par value; 47,070 shares authorized; 44,170 shares issued; 18,282 and 19,275 shares outstanding, respectively	228,532		240,944
Deferred compensation – unearned ESOP shares	(7,014)		(11,033)
Total mezzanine equity	221,518		229,911
Stockholders’ equity:
Common stock; $0.01 par value: 1,000,000 shares authorized; 73,333 and 72,071  shares issued, respectively; 70,137 and 71,570 shares outstanding, respectively	11,590		11,578
Paid-in capital	968,198		918,587
Common stock in treasury, at cost	(315,935)		(10,959)
Accumulated other comprehensive loss	(26,020)		(24,220)
Retained earnings (deficit)	57,386		(75,202)
Total ADS stockholders’ equity	695,219		819,784
Noncontrolling interest in subsidiaries	14,784		13,731
Total stockholders’ equity	710,003		833,515
Total liabilities, mezzanine equity and stockholders’ equity	$	2,506,624	$	2,413,832

See accompanying Notes to Condensed Consolidated Financial Statements.

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ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(Unaudited) (In thousands, except per share data)

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
Net sales	$	706,471	$	544,187	$	1,375,771	$	1,052,826
Cost of goods sold	506,414		338,330		974,593		658,466
Gross profit	200,057		205,857		401,178		394,360
Operating expenses:
Selling, general and administrative	73,951		65,701		150,172		127,477
(Gain) loss on disposal of assets and costs from exit and disposal activities	(901)		627		(912)		2,274
Intangible amortization	15,446		17,955		31,091		35,937
Income from operations	111,561		121,574		220,827		228,672
Other expense:
Interest expense	8,437		9,360		16,344		19,330
Derivative (gains) loss and other (income) expense, net	202		(151)		(1,812)		(718)
Income before income taxes	102,922		112,365		206,295		210,060
Income tax expense	26,816		31,827		53,271		59,027
Equity in net income of unconsolidated affiliates	(206)		(67)		(411)		(240)
Net income	76,312		80,605		153,435		151,273
Less: net income attributable to noncontrolling interest	953		369		2,089		571
Net income attributable to ADS	75,359		80,236		151,346		150,702
Weighted average common shares outstanding:
Basic	70,464		69,843		70,993		69,612
Diluted	71,924		70,755		72,614		70,459
Net income per share:
Basic	$	0.90	$	0.95	$	1.78	$	1.78
Diluted	$	0.88	$	0.93	$	1.74	$	1.76

See accompanying Notes to Condensed Consolidated Financial Statements.

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ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited) (In thousands)

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
Net income	$	76,312	$	80,605	$	153,435	$	151,273
Currency translation (loss) gain	(3,406)		2,406		(1,365)		5,556
Comprehensive income	72,906		83,011		152,070		156,829
Less: other comprehensive (loss) income attributable to  noncontrolling interest	(180)		338		435		657
Less: net income attributable to noncontrolling interest	953		369		2,089		571
Total comprehensive income attributable to ADS	$	72,133	$	82,304	$	149,546	$	155,601

See accompanying Notes to Condensed Consolidated Financial Statements.

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ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited) (In thousands)

	Six Months Ended September 30,
	2021		2020
Cash Flows from Operating Activities
Net income	$	153,435	$	151,273
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	68,850		71,559
Deferred income taxes	15		(3,446)
(Gain) loss on disposal of assets and costs from exit and disposal activities	(912)		2,274
ESOP and stock-based compensation	38,437		27,088
Amortization of deferred financing charges	191		197
Fair market value adjustments to derivatives	(446)		(1,455)
Equity in net income of unconsolidated affiliates	(411)		(240)
Other operating activities	441		(236)
Changes in working capital:
Receivables	(138,063)		(60,106)
Inventories	(124,429)		60,663
Prepaid expenses and other current assets	(6,738)		(3,666)
Accounts payable, accrued expenses, and other liabilities	104,508		42,263
Net cash provided by operating activities	94,878		286,168
Cash Flows from Investing Activities
Capital expenditures	(63,764)		(28,959)
Other investing activities	1,556		455
Net cash used in investing activities	(62,208)		(28,504)
Cash Flows from Financing Activities
Payments on syndicated Term Loan Facility	(3,500)		(103,500)
Proceeds from Revolving Credit Agreement	146,800		—
Payments on Revolving Credit Agreement	(24,200)		(100,000)
Payments on finance lease obligations	(10,437)		(10,677)
Repurchase of common stock	(292,000)		—
Cash dividends paid	(18,758)		(15,402)
Dividends paid to noncontrolling interest holder	(1,471)		—
Proceeds from exercise of stock options	3,179		3,275
Payment of withholding taxes on vesting of restricted stock units	(12,976)		—
Other financing activities	(230)		(1,489)
Net cash used in financing activities	(213,593)		(227,793)
Effect of exchange rate changes on cash	(81)		(221)
Net change in cash	(181,004)		29,650
Cash at beginning of period	195,009		174,233
Cash at end of period	$	14,005	$	203,883
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	$	61,813	$	39,213
Cash paid for interest	15,383		20,923
Non-cash operating, investing and financing activities:
Acquisition of property, plant and equipment under finance lease and incurred lease obligations	11,403		2,719
Balance in accounts payable for the acquisition of property, plant and equipment	11,499		4,100

See accompanying Notes to Condensed Consolidated Financial Statements.

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ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY AND MEZZANINE EQUITY

(Unaudited) (In thousands)

	Common Stock			Paid -In Capital		Common Stock in Treasury			Accumulated Other Comprehensive Loss		Retained (Deficit) Earnings		Total ADS Stockholders’ Equity		Non- controlling Interest in  Subsidiaries		Total Stock- holders’ Equity		Redeemable Convertible Preferred Stock			Deferred Compensation Unearned ESOP Shares			Total Mezzanine Equity
	Shares	Amount				Shares	Amount												Shares	Amount		Shares	Amount
Balance at July 1, 2020	69,973	$	11,557	$	839,765	500	$	(10,853)	$	(32,494)	$	(205,669)	$	602,306	$	12,283	$	614,589	21,562	$	269,529	1,624	$	(19,605)	$	249,924
Net income	—	—		—		—	—		—		80,236		80,236		369		80,605		—	—		—	—		—
Other comprehensive income	—	—		—		—	—		2,068		—		2,068		338		2,406		—	—		—	—		—
Redeemable convertible preferred stock dividends	—	—		—		—	—		—		(1,329)		(1,329)		—		(1,329)		—	—		—	—		—
Common stock dividends ($0.09 per share)	—	—		—		—	—		—		(6,249)		(6,249)		—		(6,249)		—	—		—	—		—
Allocation of ESOP shares to participants for compensation	—	—		6,304		—	—		—		—		6,304		—		6,304		—	—		(226)	2,826		2,826
Exercise of common stock options	59	1		1,036		—	—		—		—		1,037		—		1,037		—	—		—	—		—
Restricted stock awards	60	—		—		—	(6)		—		—		(6)		—		(6)		—	—		—	—		—
Stock-based compensation expense	—	—		5,496		—	—		—		—		5,496		—		5,496		—	—		—	—		—
ESOP distribution in common stock	410	4		6,653		—	—		—		—		6,657		—		6,657		(532)	(6,657)		—	—		(6,657)
Balance at September 30, 2020	70,502	$	11,562	$	859,254	500	$	(10,859)	$	(30,426)	$	(133,011)	$	696,520	$	12,990	$	709,510	21,030	$	262,872	1,398	$	(16,779)	$	246,093
Balance at April 1, 2020	69,810	$	11,555	$	827,573	491	$	(10,461)	$	(35,325)	$	(267,619)	$	525,723	$	11,762	$	537,485	21,562	$	269,529	1,850	$	(22,432)	$	247,097
Adoption of ASU 2016-13	—	—		—		—	—		—		(779)		(779)		—		(779)		—	—		—	—		—
Net income	—	—		—		—	—		—		150,702		150,702		571		151,273		—	—		—	—		—
Other comprehensive income	—	—		—		—	—		4,899		—		4,899		657		5,556		—	—		—	—		—
Redeemable convertible preferred stock dividends	—	—		—		—	—		—		(2,695)		(2,695)		—		(2,695)		—	—		—	—		—
Common stock dividends ($0.18 per share)	—	—		—		—	—		—		(12,620)		(12,620)		—		(12,620)		—	—		—	—		—
Allocation of ESOP shares to participants for compensation	—	—		10,340		—	—		—		—		10,340		—		10,340		—	—		(452)	5,653		5,653
Exercise of common stock options	152	2		3,275		—	—		—		—		3,277		—		3,277		—	—		—	—		—
Restricted stock awards	130	1		—		9	(398)		—		—		(397)		—		(397)		—	—		—	—		—
Stock-based compensation expense	—	—		11,095		—	—		—		—		11,095		—		11,095		—	—		—	—		—
ESOP distribution in common stock	410	4		6,653		—	—		—		—		6,657		—		6,657		(532)	(6,657)		—	—		(6,657)
Other	—	—		318		—	—		—		—		318		—		318		—	—		—	—		—
Balance at September 30, 2020	70,502	$	11,562	$	859,254	500	$	(10,859)	$	(30,426)	$	(133,011)	$	696,520	$	12,990	$	709,510	21,030	$	262,872	1,398	$	(16,779)	$	246,093

See accompanying Notes to Condensed Consolidated Financial Statements.

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ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY AND MEZZANINE EQUITY (CONTINUED)

(Unaudited) (In thousands)

	Common Stock			Paid -In Capital		Common Stock in Treasury			Accumulated Other Compre-hensive Loss		Retained (Deficit) Earnings		Total ADS Stockholders’ Equity		Non- controlling Interest in  Subsidiaries		Total Stock- holders’ Equity		Redeemable Convertible Preferred Stock			Deferred Compensation Unearned ESOP Shares			Total Mezzanine Equity
	Shares	Amount				Shares	Amount												Shares	Amount		Shares	Amount
Balance at July 1, 2021	73,227	$	11,589	$	950,963	1,678	$	(139,313)	$	(22,794)	$	(8,666)	$	791,779	$	14,525	$	806,304	18,282	$	228,532	799	$	(8,942)	$	219,590
Net income	—	—		—		—	—		—		75,359		75,359		953		76,312		—	—		—	—		—
Other comprehensive income	—	—		—		—	—		(3,226)		—		(3,226)		(180)		(3,406)		—	—		—	—		—
Redeemable convertible preferred stock dividends	—	—		—		—	—		—		(1,547)		(1,547)		—		(1,547)		—	—		—	—		—
Common stock dividends ($0.11 per share)	—	—		—		—	—		—		(7,760)		(7,760)		—		(7,760)		—	—		—	—		—
Dividends paid to noncontrolling interest holder	—	—		—		—	—		—		—		—		(514)		(514)		—	—		—	—		—
Share repurchases	—	—		—		1,518	(176,622)		—		—		(176,622)		—		(176,622)		—	—		—	—		—
Allocation of ESOP shares to participants for compensation	—	—		10,085		—	—		—		—		10,085		—		10,085		—	—		(155)	1,928		1,928
Exercise of common stock options	76	1		1,843		—	—		—		—		1,844		—		1,844		—	—		—	—		—
Restricted stock awards	30	—		—		—	—		—		—		—		—		—		—	—		—	—		—
Stock-based compensation expense	—	—		5,618		—	—		—		—		5,618		—		5,618		—	—		—	—		—
Other	—	—		(311)		—	—		—		—		(311)		—		(311)		—	—		—	—		—
Balance at September 30, 2021	73,333	$	11,590	$	968,198	3,196	$	(315,935)	$	(26,020)	$	57,386	$	695,219	$	14,784	$	710,003	18,282	$	228,532	644	$	(7,014)	$	221,518
Balance at April 1, 2021	72,071	$	11,578	$	918,587	501	$	(10,959)	$	(24,220)	$	(75,202)	$	819,784	$	13,731	$	833,515	19,275	$	240,944	966	$	(11,033)	$	229,911
Net income	—	—		—		—	—		—		151,346		151,346		2,089		153,435		—	—		—	—		—
Other comprehensive income	—	—		—		—	—		(1,800)		—		(1,800)		435		(1,365)		—	—		—	—		—
Redeemable convertible preferred stock dividends	—	—		—		—	—		—		(3,097)		(3,097)		—		(3,097)		—	—		—	—		—
Common stock dividends ($0.22 per share)	—	—		—		—	—		—		(15,661)		(15,661)		—		(15,661)		—	—		—	—		—
Dividends paid to noncontrolling interest holder	—	—		—		—	—		—		—		—		(1,471)		(1,471)		—	—		—	—		—
Share repurchases	—	—		—		2,574	(292,000)		—		—		(292,000)		—		(292,000)		—	—		—	—		—
Allocation of ESOP shares to participants for compensation	—	—		22,149		—	—		—		—		22,149		—		22,149		—	—		(322)	4,019		4,019
Exercise of common stock options	124	1		3,179		—	—		—		—		3,180		—		3,180		—	—		—	—		—
Restricted stock awards	129	1		—		29	(3,231)		—		—		(3,230)		—		(3,230)		—	—		—	—		—
Performance-based restricted stock units	245	2		—		92	(9,745)		—		—		(9,743)		—		(9,743)		—	—		—	—		—
Stock-based compensation expense	—	—		12,269		—	—		—		—		12,269		—		12,269		—	—		—	—		—
ESOP distribution in common stock	764	8		12,404		—	—		—		—		12,412		—		12,412		(993)	(12,412)		—	—		(12,412)
Other	—	—		(390)		—	—		—		—		(390)		—		(390)		—	—		—	—		—
Balance at September 30, 2021	73,333	$	11,590	$	968,198	3,196	$	(315,935)	$	(26,020)	$	57,386	$	695,219	$	14,784	$	710,003	18,282	$	228,532	644	$	(7,014)	$	221,518

See accompanying Notes to Condensed Consolidated Financial Statements.

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ADVANCED DRAINAGE SYSTEMS, INC. AND SUBSIDIARIES

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(UNAUDITED)

1.BACKGROUND AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Description of Business - Advanced Drainage Systems, Inc. and subsidiaries (collectively referred to as “ADS” or the “Company”), incorporated in Delaware, designs, manufactures and markets innovative water management solutions in the stormwater and on-site septic waste water industries, providing superior drainage solutions for use in the construction and agriculture marketplace. ADS’s products are used across a broad range of end markets and applications, including non-residential, infrastructure and agriculture applications.

The Company is managed and reports results of operations in three reportable segments: Pipe, Infiltrator Water Technologies Ultimate Holdings, Inc ("Infiltrator") and International. The Company also reports the results of its Allied Products and all other business segments as Allied Products and Other.

Historically, sales of the Company’s products have been higher in the first and second quarters of each fiscal year due to favorable weather and longer daylight conditions accelerating construction activity during these periods. Seasonal variations in operating results may also be impacted by inclement weather conditions, such as cold or wet weather, which can delay projects.

Basis of Presentation - The Company prepares its Condensed Consolidated Financial Statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Condensed Consolidated Balance Sheet as of March 31, 2021 was derived from audited financial statements included in the Annual Report on Form 10-K for the year ended March 31, 2021 (“Fiscal 2021 Form 10-K”). The accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, of a normal recurring nature, necessary to present fairly its financial position as of September 30, 2021 and the results of operations for the three and six months ended September 30, 2021 and cash flows for the six months ended September 30, 2021. The interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the notes thereto, filed in the Company’s Fiscal 2021 Form 10-K.

Principles of Consolidation - The Condensed Consolidated Financial Statements include the Company, its wholly-owned subsidiaries, its majority-owned subsidiaries and variable interest entities (“VIEs”) of which the Company is the primary beneficiary. The Company uses the equity method of accounting for equity investments where it exercises significant influence but does not hold a controlling financial interest. Such investments are recorded in Other assets in the Condensed Consolidated Balance Sheets and the related equity earnings from these investments are included in Equity in net income of unconsolidated affiliates in the Condensed Consolidated Statements of Operations. All intercompany balances and transactions have been eliminated in consolidation.

Certain prior year amounts have been reclassified to conform to the fiscal 2022 presentation.

Recent Accounting Guidance

Recently Adopted Accounting Guidance

Standard	Adoption
ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes	In December 2019, the FASB issued an ASU to simplify the accounting for income taxes by removing certain exceptions to the general principles in ASC 740, Income Taxes and improve the comparability of financial statements. The Company adopted this standard effective April 1, 2021. The Company’s adoption of the standard had no impact on the Company’s Condensed Consolidated Financial Statements.

Except for the pronouncements described above, there have been no new accounting pronouncements issued or adopted since the filing of the Fiscal 2021 Form 10-K that have significance, or potential significance, to the Condensed Consolidated Financial Statements.

2.REVENUE RECOGNITION

Revenue Disaggregation - The Company disaggregates net sales by Domestic, International and Infiltrator and further disaggregates Domestic and International by product type, consistent with its reportable segment disclosure. This disaggregation level best depicts how the nature, amount, timing and uncertainty of revenue and cash flows

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are affected by economic factors. Refer to “Note 12. Business Segments Information” for the Company’s disaggregation of Net sales by reportable segment.

Contract Balances - The Company recognizes a contract asset representing the Company’s right to recover products upon the receipt of returned products and a contract liability for the customer refund. The following table presents the balance of the Company’s contract asset and liability as of the periods presented:

	September 30, 2021		March 31, 2021
	(In thousands)
Contract asset - product returns	$	1,078	$	694
Refund liability	2,392		1,801

3.LEASES

Nature of the Company’s Leases - The Company has operating and finance leases for plants, yards, corporate offices, tractors, trailers and other equipment. The Company’s leases have remaining terms of less than one year to 30 years. A portion of the Company’s yard leases include an option to extend the leases for up to five years. The Company has included renewal options which are reasonably certain to be exercised in its right-of-use assets and lease liabilities.

Master Lease Agreement – In May 2021, the Company entered into a Master Lease Agreement and an Interim Funding Agreement with Fifth Third Bank, National Association, (“Fifth Third”) to finance its procurement of material handling equipment, trucks and trailers (the “Master Lease Agreement”). The Master Lease Agreement and Interim Funding Agreement have a combined initial capacity of $65.0 million. Financings will either bear interest at a fixed rental amount or at a rate based on the London Interbank Offered Rate plus the applicable margin. As of September 30, 2021, the Company had lease financings of $5.5 million outstanding under the agreements.

4.INVENTORIES

Inventories as of the periods presented consisted of the following:

	September 30, 2021		March 31, 2021
	(In thousands)
Raw materials	$	147,584	$	75,294
Finished goods	277,660		225,667
Total inventories	$	425,244	$	300,961

5.FAIR VALUE MEASUREMENTS AND DERIVATIVE TRANSACTIONS

The Company uses commodity options in the form of collars and swaps and has previously used interest rate swaps and foreign currency forward contracts to manage its various exposures to interest rate, commodity price fluctuations and foreign currency exchange rate fluctuations. Mark-to-market adjustments for changes in fair value and contract settlement gains and losses for collars, commodity swaps and foreign currency forward contracts are recorded in the Condensed Consolidated Statements of Operations in Derivative (gains) loss and other (income) expense, net.

When applying fair value principles in the valuation of assets and liabilities, the Company is required to maximize the use of quoted market prices and minimize the use of unobservable inputs. The Company has not changed its valuation techniques used in measuring the fair value of any financial assets or liabilities during the fiscal periods presented. The fair value estimates take into consideration the credit risk of both the Company and its counterparties.

When active market quotes are not available for financial assets and liabilities, the Company uses industry standard valuation models. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including credit risk, interest rate curves, foreign currency rates and forward and spot prices for currencies. In circumstances where market-based observable inputs are not available, management judgment is used to develop assumptions to estimate fair value.

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Recurring Fair Value Measurements - The assets and liabilities carried at fair value as of the periods presented were as follows:

	September 30, 2021
	Total		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Derivative assets – diesel fuel contracts	$	1,715	—	$	1,715	—
Total assets at fair value on a recurring basis	$	1,715	—	$	1,715	—
Liabilities:
Derivative liabilities – diesel fuel contracts	$	107	—	$	107	—
Total liabilities at fair value on a recurring basis	$	107	—	$	107	—

	March 31, 2021
	Total		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Derivative assets – diesel fuel contracts	$	1,194	—	$	1,194	—
Total assets at fair value on a recurring basis	$	1,194	—	$	1,194	—
Liabilities:
Derivative liabilities - diesel fuel contracts	$	32	—	$	32	—
Total liabilities at fair value on a recurring basis	$	32	—	$	32	—

For the six months ended September 30, 2021 and 2020, respectively, there were no transfers in or out of Levels 1, 2 or 3.

The Company recorded net (gains) and net losses on mark-to-market adjustments for changes in the fair value of derivatives contracts as well as net (gains) and net losses on the settlement of derivative contracts as follows:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Diesel fuel option collars	$	229	$	(373)	$	(446)	$	(1,455)
Total net unrealized mark-to-market loss (gains)	$	229	$	(373)	$	(446)	$	(1,455)
Diesel fuel option collars	(752)		477		(1,266)		1,317
Total net realized (gain) loss	$	(752)	$	477	$	(1,266)	$	1,317

Valuation of Debt - The carrying amounts of current financial assets and liabilities approximate fair value because of the immediate or short-term maturity of these items, or in the case of derivative instruments, because they are recorded at fair value. The following table presents the carrying and fair value of the Company’s Senior Notes (as defined below and further discussed in “Note 8. Debt”) for the periods presented:

	September 30, 2021				March 31, 2021
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior Notes	$	365,428	$	350,000	$	367,633	$	350,000

The fair value of the Senior Notes was determined based on a quoted market data for the Company’s Senior Notes. The categorization of the framework used to evaluate the Senior Notes is considered Level 2. The Company believes the carrying amount on the remaining long-term debt, including the Term Loan Facility and Revolving Credit Facility, is not materially different from its fair value as the interest rates and terms of the borrowings are similar to currently available borrowings.

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6.NET INCOME PER SHARE AND STOCKHOLDERS' EQUITY

The Company is required to apply the two-class method to compute both basic and diluted net income per share. The two-class method is an earnings allocation formula that treats participating securities as having rights to earnings that would otherwise have been available to common stockholders.

The following table presents information necessary to calculate net income per share for the periods presented, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive:

	Three Months Ended September 30,				Six Months Ended September 30,
(In thousands, except per share data)	2021		2020		2021		2020
NET INCOME PER SHARE—BASIC:
Net income attributable to ADS	$	75,359	$	80,236	$	151,346	$	150,702
Adjustments for:
Dividends to participating securities	(1,636)		(1,329)		(3,276)		(2,697)
Net income available to common stockholders and participating securities	73,723		78,907		148,070		148,005
Undistributed income allocated to participating securities	(10,494)		(12,760)		(21,430)		(24,025)
Net income available to common stockholders – Basic	$	63,229	$	66,147	$	126,640	$	123,980
Weighted average number of common shares outstanding – Basic	70,464		69,843		70,993		69,612
Net income per common share – Basic	$	0.90	$	0.95	$	1.78	$	1.78
NET INCOME PER SHARE—DILUTED:
Net income available to common stockholders – Diluted	$	63,229	$	66,147	$	126,640	$	123,980
Weighted average number of common shares outstanding – Basic	70,464		69,843		70,993		69,612
Assumed restricted stock - nonparticipating	223		196		251		185
Assumed exercise of stock options	914		716		928		662
Assumed performance units	323		—		442		—
Weighted average number of common shares outstanding – Diluted	71,924		70,755		72,614		70,459
Net income per common share – Diluted	$	0.88	$	0.93	$	1.74	$	1.76
Potentially dilutive securities excluded as anti-dilutive	13,356		14,892		13,729		15,279

Stockholders’ Equity – During the three and six months ended September 30, 2021, the Company repurchased 1.5 million and 2.6 million shares of common stock, respectively, at a cost of $176.6 million and $292.0 million, respectively. The repurchases were made under the Board of Directors’ authorization in May 2021 to repurchase up to an additional $250 million, in addition to the $42 million previously authorized, of ADS common stock in accordance with applicable securities laws. As of September 30, 2021, the Company has utilized all of the common stock repurchase authorization. The repurchase program does not obligate the Company to acquire any particular amount of common stock and may be suspended or terminated at any time at the Company’s discretion.

On October 1, 2021, ADS completed an ESOP distribution of 1.1 million common shares to participants, which will be recorded in the third quarter of fiscal 2022. The distribution will reduce the balance of Redeemable preferred common stock by $17.6 million and increase Paid-in capital.

7.RELATED PARTY TRANSACTIONS

ADS Mexicana - ADS conducts business in Mexico and Central America through its joint venture ADS Mexicana, S.A. de C.V. (together with its affiliate ADS Corporativo, S.A. de C.V., “ADS Mexicana”). ADS owns 51% of the outstanding stock of ADS Mexicana and consolidates ADS Mexicana for financial reporting purposes.

On June 22, 2018, the Company and ADS Mexicana entered into an Intercompany Revolving Credit Promissory Note (the “Intercompany Note”) with a borrowing capacity of $12.0 million. The Intercompany Note matures on June 22, 2022. The Intercompany Note indemnifies the ADS Mexicana joint venture partner for 49% of any unpaid

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borrowing. The interest rates under the Intercompany Note are determined by certain base rates or London Interbank Offered Rate (“LIBOR”) plus an applicable margin based on the Leverage Ratio. As of September 30, 2021 and March 31, 2021, there were no borrowings outstanding under the Intercompany Note.

South American Joint Venture - The Tuberias Tigre - ADS Limitada joint venture (the “South American Joint Venture”) manufactures and sells HDPE corrugated pipe in certain South American markets. ADS owns 50% of the South American Joint Venture. ADS is the guarantor of 50% of the South American Joint Venture’s credit arrangement, and the debt guarantee is shared equally with the joint venture partner. The Company’s maximum potential obligation under this guarantee is $11.0 million as of September 30, 2021. The maximum borrowings permitted under the South American Joint Venture’s credit facility are $22.0 million. The Company does not anticipate any required contributions related to the balance of this credit arrangement. As of September 30, 2021 and March 31, 2021, the outstanding principal balances of the credit facility including letters of credit were $8.9 million and $10.0 million, respectively. As of September 30, 2021, there were no U.S. dollar denominated loans. The weighted average interest rate as of September 30, 2021 was 4.4% on Chilean peso denominated loans.

8.DEBT

Long-term debt as of the periods presented consisted of the following:

	September 30, 2021		March 31, 2021
	(In thousands)
Term Loan Facility	$	437,750	$	441,250
Senior Notes	350,000		350,000
Revolving Credit Facility	122,600		—
Total	910,350		791,250
Unamortized debt issuance costs	(1,839)		(2,030)
Current maturities	(7,000)		(7,000)
Long-term debt obligations	$	901,511	$	782,220

Senior Secured Credit Facilities – In July 2019, the Company entered into the credit agreement (the “Base Credit Agreement”) by and among the Company, as borrower, Barclays Bank PLC, as administrative agent, the several lenders from time to time party thereto. In September 2019, the Company amended the Base Credit Agreement (as amended the “Senior Secured Credit Facility”). The Senior Secured Credit Facility provides for a term loan facility in an initial aggregate principal amount of $700 million (the “Term Loan Facility”), a revolving credit facility in an initial aggregate principal amount of up to $350 million (the “Revolving Credit Facility”), a letter of credit sub-facility in the initial aggregate available amount of up to $50 million, as a sublimit of such Revolving Credit Facility (the “L/C Facility”) and a swing line sub-facility in the aggregate available amount of up to $50 million, as a sublimit of the Revolving Credit Facility (together with the Term Loan Facility, the Revolving Credit Facility and the L/C Facility, the “Senior Secured Credit Facility”).

During the six months ended September 30, 2021, the Company received proceeds of $146.8 million from the Revolving Credit Facility and repaid $3.5 million of the Term Loan Facility and $24.2 million of the Revolving Credit Facility. Letters of credit outstanding at September 30, 2021 and March 31, 2021 amount to $12.5 million and $11.0 million, respectively, and reduced the availability of the Revolving Credit Facility.

Senior Notes – On September 23, 2019, the Company issued $350.0 million aggregate principal amount of 5.0% senior notes due 2027 (the “Senior Notes”) pursuant to an Indenture, dated September 23, 2019 (the “Indenture”), among the Company, the guarantors party thereto (the “Guarantors”) and U.S. Bank National Association, as Trustee (the “Trustee”). The Senior Notes are guaranteed by each of the Company’s present and future direct and indirect wholly owned domestic subsidiaries that is a guarantor under the Company's Senior Secured Credit Facility. The Senior Notes were offered and sold either to persons reasonably believed to be “qualified institutional buyers” pursuant to Rule 144A under the Securities Act of 1933 (the “Securities Act”) or to persons outside the United States under Regulation S of the Securities Act.

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9.COMMITMENTS AND CONTINGENCIES

Purchase Commitments

The Company has historically secured supplies of resin raw material by agreeing to purchase quantities during a future given period at a fixed price. These purchase contracts typically ranged from 1 to 12 months and occur in the ordinary course of business. The Company also enters into equipment purchase contracts with manufacturers. The Company does not have any outstanding purchase commitments as of September 30, 2021.

Litigation and Other Proceedings – The Company is involved from time to time in various legal proceedings that arise in the ordinary course of business, including but not limited to commercial disputes, environmental matters, employee related claims, intellectual property disputes and litigation in connection with transactions including acquisitions and divestitures. The Company does not believe that such litigation, claims, and administrative proceedings will have a material adverse impact on the Company’s financial position or results of operations. The Company records a liability when a loss is considered probable, and the amount can be reasonably estimated.

10.INCOME TAXES

The Company’s effective tax rate will vary based on a variety of factors, including overall profitability, the geographical mix of income before taxes and related tax rates in jurisdictions where it operates and other one-time charges, as well as the occurrence of discrete events. For the three months ended September 30, 2021 and 2020, the Company utilized an effective tax rate of 26.1% and 28.3%, respectively, to calculate its provision for income taxes. State and local income taxes and the Company’s Employee Stock Ownership Plan (“ESOP”) increased the effective rate for the three months ended September 30, 2021 and 2020. Additionally, discrete income tax benefits related to the stock-based compensation windfall and other items decreased the rate for the three months ended September 30, 2021.

For the six months ended September 30, 2021 and 2020, the Company utilized an effective tax rate of 25.8% and 28.1%, respectively,to calculate its provision for income taxes. State and local income taxes and the Company’s ESOP increased the effective rate for the the six months ended September 30, 2021 and 2020. Additionally, discrete income tax benefits related to the stock-based compensation windfall and other items decreased the rate for the six months ended September 30, 2021.

11.STOCK-BASED COMPENSATION

ADS has several programs for stock-based payments to employees and non-employee members of its Board of Directors, including stock options, performance-based restricted stock units and restricted stock. Equity-classified restricted stock awards are measured based on the grant-date estimated fair value of each award. The Company accounts for all restricted stock granted to Directors as equity-classified awards. The Company recognized stock-based compensation expense in the following line items of the Condensed Consolidated Statements of Operations for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Component of income before income taxes:
Cost of goods sold	$	685	$	565	$	1,319	$	966
Selling, general and administrative expenses	4,933		4,931		10,950		10,129
Total stock-based compensation expense	$	5,618	$	5,496	$	12,269	$	11,095

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The following table summarizes stock-based compensation expense by award type for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Stock-based compensation expense:
Stock Options	$	860	$	750	$	1,613	$	1,631
Restricted Stock	1,520		1,344		2,879		2,761
Performance-based Restricted Stock Units	2,773		3,070		6,961		6,054
Non-Employee Directors	465		332		816		649
Total stock-based compensation expense	$	5,618	$	5,496	$	12,269	$	11,095

2017 Omnibus Plan

On May 24, 2017, the Board of Directors approved the 2017 Omnibus Incentive Plan (the “2017 Incentive Plan”) which was approved by the Company’s stockholders on July 17, 2017. The 2017 Incentive Plan provides for the issuance of a maximum of 5.0 million shares of the Company’s common stock for awards made thereunder, which awards may consist of stock options, restricted stock, restricted stock units, stock appreciation rights, phantom stock, cash-based awards, performance awards (which may take the form of performance cash, performance units or performance shares) or other stock-based awards.

Restricted Stock - During the three and six months ended September 30, 2021, the Company granted less than 0.1 million shares and 0.1 million shares of restricted stock with a grant date fair value of $2.0 million and $7.3 million, respectively.

Performance-based Restricted Stock Units ("Performance Units") –During the six months ended September 30, 2021, the Company granted 0.1 million performance share units were granted at a grant date fair value of $5.3 million.

Options - During the six months ended September 30, 2021, The Company granted 0.1 million nonqualified stock options under the 2017 Incentive Plan with a grant date fair value of $4.2 million. The Company estimates the fair value of stock options using a Black-Scholes option-pricing model. The following table summarizes the assumptions used to estimate the fair value of stock-options during the periods presented:

	Six Months Ended September 30, 2021
Common stock price	$105.82
Expected stock price volatility	41.0%
Risk-free interest rate	1.1%
Weighted-average expected option life (years)	6.0
Dividend yield	0.3%

12.BUSINESS SEGMENTS INFORMATION

The Company operates its business in three distinct reportable segments: “Pipe”, “International” and “Infiltrator.” “Allied Products & Other” represents the Company’s Allied Products and all other business segments. “Pipe” and “Allied Products & Other” were previously included as Domestic. The Chief Operating Decision Maker (the “CODM”) evaluates segment reporting based on Net Sales and Segment Adjusted Gross Profit. The Company calculated Segment Adjusted Gross Profit as net sales less costs of goods sold, depreciation and amortization, stock-based compensation and non-cash charges. A measure of assets is not applicable, as segment assets are not regularly reviewed by the CODM for evaluating performance or allocating resources.

Pipe – The Pipe segment manufactures and markets high performance thermoplastic corrugated pipe throughout the United States. The Company maintains and serves these markets through product distribution relationships with many of the largest national and independent waterworks distributors, buying groups and co-ops, major national retailers as well as an extensive network of hundreds of small to medium-sized distributors across the United States.

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Products include single wall pipe, N-12 HDPE pipe sold into the Storm sewer, Infrastructure and Agriculture markets, High Performance polypropylene pipe sold into the Storm sewer, Infrastructure and sanitary sewer markets. Products are designed primarily for storm water management in the construction and infrastructure marketplace across a broad range of end markets and applications, including non-residential, residential, agriculture and infrastructure. Products are manufactured using HDPE and polypropylene plastic material.

Infiltrator – Infiltrator is a leading national provider of plastic leach field chambers and systems, septic tanks and accessories, primarily for use in residential applications. Infiltrator products are used in on-site septic wastewater treatment systems in the United States and Canada.

International – The International segment manufactures and markets pipe and allied products in certain regions outside of the United States, including Company owned facilities in Canada, subsidiaries that distribute to Europe and the Middle East, exports and through the Company’s joint ventures with local partners in Mexico and South America. The Company’s Mexican joint venture, ADS Mexicana, primarily serves the Mexican and Central American markets, while its South American Joint Venture, Tigre-ADS, is the primary channel to serve the South American markets. The Company’s International product lines include single wall pipe, N-12 HDPE pipe, high performance PP pipe and certain geographies also sell our broad line of Allied Products.

Allied Products & Other – Allied Products and Other manufactures and markets products throughout the United States. Products include StormTech, Nyloplast, ARC Septic Chambers, Inserta Tee, BaySaver filters and water quality structures, Fittings, and FleXstorm. The Company maintains and serves these markets through product distribution relationships with many of the largest national and independent waterworks distributors, major national retailers as well as an extensive network of hundreds of small to medium-sized distributors across the United States. The Company also sells through a broad variety of buying groups and co-ops in the United States. The Company aggregates operating segments within the Allied Products & Other segment disclosure. None of the operating segments within the Allied Products & Other businesses segment disclosure exceeds the quantitative thresholds for separate segment reporting.

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The following table sets forth reportable segment information with respect to the amount of Net sales contributed by each class of similar products for the periods presented:

	Three Months Ended
	September 30, 2021						September 30, 2020
(In thousands)	Net Sales		Intersegment Net Sales		Net Sales from External Customers		Net Sales		Intersegment Net Sales		Net Sales from External Customers
Pipe	$	384,521	$	(2,668)	$	381,853	$	292,133	$	(1,637)	$	290,496
Infiltrator	145,911		(22,412)		123,499		105,986		(18,692)		87,294
International
International - Pipe	50,141		(5,170)		44,971		35,592		(896)		34,696
International - Allied Products & Other	13,433		—		13,433		13,706		—		13,706
Total International	63,574		(5,170)		58,404		49,298		(896)		48,402
Allied Products & Other	145,719		(3,004)		142,715		117,995		—		117,995
Intersegment Eliminations	(33,254)		33,254		—		(21,225)		21,225		—
Total Consolidated	$	706,471	$	—	$	706,471	$	544,187	$	—	$	544,187
	Six Months Ended
	September 30, 2021						September 30, 2020
(In thousands)	Net Sales		Intersegment Net Sales		Net Sales from External Customers		Net Sales		Intersegment Net Sales		Net Sales from External Customers
Pipe	$	758,531	$	(4,571)	$	753,960	$	565,785	$	(3,482)	$	562,303
Infiltrator	272,653		(41,449)		231,204		208,139		(36,760)		171,379
International
International - Pipe	100,979		(8,084)		92,895		62,542		(896)		61,646
International - Allied Products & Other	27,961		—		27,961		22,585		—		22,585
Total International	128,940		(8,084)		120,856		85,127		(896)		84,231
Allied Products & Other	272,755		(3,004)		269,751		234,913		—		234,913
Intersegment Eliminations	(57,108)		57,108		—		(41,138)		41,138		—
Total Consolidated	$	1,375,771	$	—	$	1,375,771	$	1,052,826	$	—	$	1,052,826

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The following sets forth certain financial information attributable to the reportable segments for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Segment Adjusted Gross Profit
Pipe	$	82,472	$	100,496	$	166,615	$	191,095
Infiltrator	58,847		53,105		118,249		101,033
International	15,077		14,582		36,455		25,990
Allied Products & Other	67,979		60,380		131,278		120,848
Intersegment Eliminations	1,479		372		1,465		14
Total	$	225,854	$	228,935	$	454,062	$	438,980
Depreciation and Amortization
Pipe	$	12,026	$	11,543	$	24,061	$	22,903
Infiltrator	3,375		3,005		6,811		6,138
International	1,290		1,302		2,748		2,600
Allied Products & Other(a)	17,503		19,928		35,230		39,918
Total	$	34,194	$	35,778	$	68,850	$	71,559
Capital Expenditures
Pipe	$	12,809	$	3,911	$	22,639	$	8,142
Infiltrator	22,134		13,781		35,160		17,979
International	1,264		297		1,514		747
Allied Products & Other(a)	2,011		675		4,451		2,091
Total	$	38,218	$	18,664	$	63,764	$	28,959

(a)Includes depreciation, amortization and capital expenditures not allocated to a reportable segment. The amortization expense of Infiltrator intangible assets acquired is included in Allied Products & Other.

Reconciliation of Gross Profit to Segment Adjusted Gross profit

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Reconciliation of Segment Adjusted Gross Profit:
Total Gross Profit	$	200,057	$	205,857	$	401,178	$	394,360
Depreciation and Amortization	17,250		16,463		34,782		32,886
ESOP and stock-based compensation expense	8,547		6,598		18,102		11,537
COVID-19 related costs(a)	—		17		—		197
Total Segment Adjusted Gross Profit	$	225,854	$	228,935	$	454,062	$	438,980

(a)Includes expenses directly related to our response to the COVID-19 pandemic, including adjustments to our pandemic pay program and expenses associated with our third-party crisis management vendor.

13.SUBSEQUENT EVENTS

Common Stock Dividend - During the third quarter of fiscal 2022, the Company declared a quarterly cash dividend of $0.11 per share of common stock. The dividend is payable on December 15, 2021 to stockholders of record at the close of business on December 1, 2021.

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Item 2.         Management’s Discussion and Analysis of Financial Condition and Results of Operations

Unless the context otherwise indicates or requires, as used in this Quarterly Report on Form 10-Q, the terms “we,” “our,” “us,” “ADS” and the “Company” refer to Advanced Drainage Systems, Inc. and its directly- and indirectly-owned subsidiaries as a combined entity, except where it is clear that the terms mean only Advanced Drainage Systems, Inc. exclusive of its subsidiaries.

Our fiscal year begins on April 1 and ends on March 31. Unless otherwise noted, references to “year” pertain to our fiscal year. For example, 2022 refers to fiscal 2022, which is the period from April 1, 2021 to March 31, 2022.

The following discussion and analysis of the financial condition and results of our operations should be read in conjunction with our Condensed Consolidated Financial Statements and related footnotes included elsewhere in this Quarterly Report on Form 10-Q and with the audited Consolidated Financial Statements included in our Fiscal 2021 Form 10-K, as filed with the Securities and Exchange Commission (the “SEC”) on May 27, 2021. In addition to historical condensed consolidated financial information, the following discussion contains forward-looking statements that reflect our plans, estimates and beliefs. Our actual results could differ materially from those discussed in the forward-looking statements. This discussion contains forward-looking statements that are based on the beliefs of our management, as well as assumptions made by, and information currently available to, our management. Our actual results could differ materially from those discussed in the forward-looking statements. For more information, see the section below entitled “Forward Looking Statements.”

We consolidate our joint ventures for purposes of GAAP, except for our South American Joint Venture.

Overview

ADS is the leading manufacturer of innovative water management solutions in the stormwater and on-site septic wastewater industries, providing superior drainage solutions for use in the construction and agriculture marketplaces. Our innovative products, for which we hold many patents, are used across a broad range of end markets and applications, including non-residential, infrastructure and agriculture applications. We have established a leading position in many of these end markets by leveraging our national sales and distribution platform, industry-acclaimed engineering support, overall product breadth and scale plus manufacturing excellence.

Impact of COVID-19

In March 2020, the World Health Organization categorized the novel coronavirus (“COVID-19”) as a pandemic, and it continues to spread throughout the United States and globally. The COVID-19 pandemic has resulted, and is likely to continue to result, in significant economic disruptions and may have an adverse effect on our business. Significant uncertainty exists concerning the magnitude of the impact and duration of the COVID-19 pandemic. While our production facilities are operating as essential businesses, the Company continues to assess the potential effects and may experience future impacts such as reduced operations or temporarily closing facilities.

Executive Summary

Second Quarter Fiscal 2022 Results

•Net sales increased 29.8% to $706.5 million

•Net income decreased 5.3% to $76.3 million

•Adjusted EBITDA, a non-GAAP measure, decreased 5.3% to $164.8 million

Net sales increased $162.3 million, or 29.8%, to $706.5 million, as compared to $544.2 million in the prior year quarter. Domestic pipe sales increased $92.4 million, or 31.6%, to $384.5 million. Domestic allied products & other sales increased $27.7 million, or 23.5%, to $145.7 million. Infiltrator sales increased $39.9 million, or 37.7%, to $145.9 million. These increases were driven by double-digit sales growth in both the U.S. construction and agriculture end markets. International sales increased $14.3 million, or 29.0%, to $63.6 million, driven by double-digit sales growth in the Canadian and Mexican businesses..

Gross profit decreased $5.8 million, or 2.8%, to $200.1 million as compared to $205.9 million in the prior year. In the second quarter, favorable pricing primarily offset the inflationary cost pressure on materials, diesel and labor. The decrease in gross profit is primarily due to an increase in the use of third-party logistics services due to labor shortages impacting the manufacturing and transportation operations.

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Adjusted EBITDA, a non-GAAP measure, decreased $9.3 million, or 5.3%, to $164.8 million, as compared to $174.1 million in the prior year. The decrease is primarily due to the factors mentioned above. As a percentage of net sales, Adjusted EBITDA was 23.3% as compared to 32.0% in the prior year.

Year-to-Date Fiscal 2022 Results

•Net sales increased 30.7% to $1,375.8 million

•Net income increased 1.4% to $153.4 million

•Adjusted EBITDA, a non-GAAP measure, decreased 0.6% to $331.4 million

•Cash provided by operating activities of $94.9 million

•Free cash flow, a non-GAAP measure, of $31.1 million

Net sales increased $322.9 million, or 30.7%, to $1,375.8 million, as compared to $1,052.8 million in the prior year. Domestic pipe sales increased $192.7 million, or 34.1%, to $758.5 million. Domestic allied products & other sales increased $37.8 million, or 16.1%, to $272.8 million. Infiltrator sales increased $64.5 million, or 31.0%, to $272.7 million. These increases were driven by double-digit sales growth in both the U.S. construction and agriculture end markets. International sales increased $43.8 million, or 51.5%, to $128.9 million, driven by double-digit sales growth in the Canadian, Mexican and Exports businesses.

Gross profit increased $6.8 million, or 1.7%, to $401.2 million as compared to $394.4 million in the prior year. The increase is primarily due an increase in sales volume and favorable pricing on pipe, on-site septic and allied products. These increases were partially offset by inflationary cost pressure on materials, transportation and labor, as well as an increase in the use of third-party logistics services due to labor shortages impacting the manufacturing and transportation operations.

Adjusted EBITDA, a non-GAAP measure, decreased $2.2 million, or 0.6%, to $331.4 million, as compared to $333.5 million in the prior year. The decrease is primarily due to the factors mentioned above. As a percentage of net sales, Adjusted EBITDA was 24.1% as compared to 31.7% in the prior year.

Results of Operations

Comparison of the Three Months ended September 30, 2021 to the Three Months ended September 30, 2020

The following table summarizes our operating results as a percentage of net sales that have been derived from our Condensed Consolidated Financial Statements for the periods presented. We believe this presentation is useful to investors in comparing historical results.

	For the Three Months Ended September 30,
	2021				2020
Consolidated Statements of Operations data:	(In thousands)
Net sales	$	706,471	100.0	%	$	544,187	100.0	%
Cost of goods sold	506,414		71.7		338,330		62.2
Gross profit	200,057		28.3		205,857		37.8
Selling, general and administrative	73,951		10.5		65,701		12.1
(Gain) loss on disposal of assets and costs from exit and  disposal activities	(901)		(0.1)		627		0.1
Intangible amortization	15,446		2.2		17,955		3.3
Income from operations	111,561		15.8		121,574		22.3
Interest expense	8,437		1.2		9,360		1.7
Derivative gains (loss) and other income (expense), net	202		—		(151)		—
Income before income taxes	102,922		14.6		112,365		20.6
Income tax expense	26,816		3.8		31,827		5.8
Equity in net income of unconsolidated affiliates	(206)		—		(67)		—
Net income	76,312		10.8		80,605		14.8
Less: net income attributable to noncontrolling interest	953		0.1		369		0.1
Net income attributable to ADS	$	75,359	10.7	%	$	80,236	14.7	%

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Net sales - The following table presents net sales to external customers by reportable segment for the three months ended September 30, 2021 and 2020.

(Amounts in thousands)	2021		2020		$ Variance		% Variance
Pipe	$	381,853	$	290,496	$	91,357	31.4	%
Infiltrator	123,499		87,294		36,205		41.5
International	58,404		48,402		10,002		20.7
Allied Products & Other	142,715		117,995		24,720		21.0
Total Consolidated	$	706,471	$	544,187	$	162,284	29.8	%

Our consolidated net sales for the three months ended September 30, 2021 increased by $162.3 million, or 29.8%, compared to the same period in fiscal 2021. The increase in net sales was primarily a result of growth in our domestic Pipe along with both the Infiltrator and International segments.

Our Pipe segment experienced growth primarily through improved pricing/mix of products sold. Infiltrator achieved growth through improved price/mix of products sold and higher volumes associated with the residential market. The increase in our International segment was driven by growth in the Canadian and Mexican businesses. Growth in Allied Products & Other was driven mainly by improved price/mix of products offerings.

Cost of goods sold and Gross profit - The following table presents gross profit by reportable segment for the three months ended September 30, 2021 and 2020.

(Amounts in thousands)	2021		2020		$ Variance		% Variance
Pipe	$	62,627	$	82,944	$	(20,317)	(24.5)	%
Infiltrator	55,350		49,946		5,404		10.8
International	13,792		13,260		532		4.0
Allied Products & Other	66,809		59,335		7,474		12.6
Intersegment eliminations	1,479		372		1,107		297.6
Total gross profit	$	200,057	$	205,857	$	(5,800)	(2.8)	%

Our consolidated Cost of goods sold for the three months ended September 30, 2021 increased by $168.1 million, or 49.7%, and our consolidated Gross profit decreased by $5.8 million, or 2.8%, compared to the same period in fiscal 2021. The decrease in our gross profit was due to inflationary pressures of higher material and transportation costs along with higher manufacturing costs partially offset by an increase in net sales from improved pricing.

Selling, general and administrative expenses

	Three Months Ended September 30,
(Amounts in thousands)	2021			2020
Selling, general and administrative expenses	$	73,951		$	65,701
% of Net sales	10.5		%	12.1		%

Selling, general and administrative expenses for three months ended September 30, 2021 increased $8.3 million from the same period in fiscal 2021 and as a percentage of sales, decreased by 1.6%. The increase in Selling, general and administrative expenses is the result of increased headcount to support business growth along with higher spend in various areas impacted last year by COVID-19 including travel and entertainment expenses.

(Gain) loss on disposal of assets and costs from exit and disposal activities - The change in (Gain) loss on disposal of assets and costs from exit and disposal activities is primarily due to asset disposals.

Intangible amortization - Intangible amortization decreased $2.5 million due to the accelerated method of amortization for customer relationships.

Interest expense - Interest expense decreased $0.9 million in the three months ended September 30, 2021 compared to the same period in the previous fiscal year. The decrease was primarily due to decreased average debt levels.

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Derivative gain (loss) and other income (expense), net - Derivative gain (loss) and other income (expense) increased by $0.4 million for the three months ended September 30, 2021 compared to the same period in the previous fiscal year.

Income tax expense (benefit) - The following table presents the effective tax rates for the three months ended September 30, 2021 and 2020.

	Three Months Ended September 30,
	2021		2020
Effective tax rate	26.1	%	28.3	%

The change in the effective tax rate was primarily due to discrete income tax events related to the stock-based compensation windfall and other items. See “Note 10. Income Taxes” for additional information.

Equity in net income of unconsolidated affiliates - The Equity in net income of unconsolidated affiliates increased for the three months ended September 30, 2021 as compared to the same period in the previous fiscal year due to an increase in the current period income at our South American Joint Venture.

Net income attributable to noncontrolling interest - Net income attributable to noncontrolling interest increased for three months ended September 30, 2021 due to an increase in net income at our ADS Mexicana joint venture.

Comparison of the Six Months Ended September 30, 2021 to the Six Months Ended September 30, 2020

The following table summarizes our operating results as a percentage of net sales that have been derived from our Condensed Consolidated Financial Statements for the periods presented. We believe this presentation is useful to investors in comparing historical results.

	For the Six Months Ended September 30,
	2021				2020
Consolidated Statements of Operations data:	(In thousands)
Net sales	$	1,375,771	100.0	%	$	1,052,826	100.0	%
Cost of goods sold	974,593		70.8		658,466		62.5
Gross profit	401,178		29.2		394,360		37.5
Selling, general and administrative	150,172		10.9		127,477		12.1
(Gain) loss on disposal of assets and costs from exit and  disposal activities	(912)		(0.1)		2,274		0.2
Intangible amortization	31,091		2.3		35,937		3.4
Income from operations	220,827		16.1		228,672		21.7
Interest expense	16,344		1.2		19,330		1.8
Derivative loss and other expense, net	(1,812)		(0.1)		(718)		(0.1)
Income before income taxes	206,295		15.0		210,060		20.0
Income tax expense	53,271		3.9		59,027		5.6
Equity in net income of unconsolidated affiliates	(411)		—		(240)		—
Net income	153,435		11.2		151,273		14.4
Less: net income attributable to noncontrolling interest	2,089		0.2		571		0.1
Net income attributable to ADS	$	151,346	11.0	%	$	150,702	14.3	%

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Net sales - The following table presents net sales to external customers by reportable segment for the six months ended September 30, 2021 and 2020.

(Amounts in thousands)	2021		2020		$ Variance		% Variance
Pipe	$	753,960	$	562,303	$	191,657	34.1	%
Infiltrator	231,204		171,379		59,825		34.9
International	120,856		84,231		36,625		43.5
Allied Products & Other	269,751		234,913		34,838		14.8
Total Consolidated	$	1,375,771	$	1,052,826	$	322,945	30.7	%

Our consolidated net sales for the six months ended September 30, 2021 increased by $322.9 million, or 30.7%, compared to the same period in fiscal 2021. The increase in net sales was primarily a result of growth in our domestic Pipe along with both the Infiltrator and International segments.

Our Pipe segment experienced growth in the residential, agriculture and construction markets through both higher volumes and improved pricing/mix of products sold. Infiltrator achieved growth through improved price/mix of products sold and higher volumes associated with the residential market. The increase in our International segment was driven by growth in the Canadian, Mexican and Export businesses. Growth in Allied Products & Other was driven mainly by improved price/mix of products offerings.

Cost of goods sold and Gross profit - The following table presents gross profit by reportable segment for the six months ended September 30, 2021 and 2020.

(Amounts in thousands)	2021		2020		$ Variance		% Variance
Pipe	$	125,927	$	157,639	$	(31,712)	(20.1)	%
Infiltrator	111,219		94,677		16,542		17.5
International	33,696		23,367		10,329		44.2
Allied Products & Other	128,871		118,663		10,208		8.6
Intersegment eliminations	1,465		14		1,451		10,364.3
Total gross profit	$	401,178	$	394,360	$	6,818	1.7	%

Our consolidated Cost of goods sold for the six months ended September 30, 2021 increased by $316.1 million, or 48.0%, and our consolidated Gross profit increased by $6.8 million, or 1.7%, compared to the same period in fiscal 2021. The increase in our gross profit was due to an increase in net sales from higher volumes and improved pricing and was partially offset by inflationary pressures of higher material and transportation costs along with higher manufacturing costs.

Selling, general and administrative expenses

	Three Months Ended September 30,
(Amounts in thousands)	2021			2020
Selling, general and administrative expenses	$	150,172		$	127,477
% of Net sales	10.9		%	12.1		%

Selling, general and administrative expenses for six months ended September 30, 2021 increased $22.7 million from the same period in fiscal 2021 and as a percentage of sales, decreased by 1.2%. The increase in Selling, general and administrative expenses is the result of increased headcount to support business growth along with higher spend in various areas impacted last year by COVID-19 including travel and entertainment expenses.

(Gain) loss on disposal of assets and costs from exit and disposal activities - The change in (Gain) loss on disposal of assets and costs from exit and disposal activities is primarily due to asset disposals.

Intangible amortization - Intangible amortization decreased by $4.8 million primarily due the accelerated method of amortization for customer relationships

Interest expense - Interest expense decreased $3.0 million in the six months ended September 30, 2021 compared to the same period in the previous fiscal year. The decrease was primarily due to decreased average debt levels.

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Derivative gain (loss) and other income (expense), net - Derivative gain (loss) and other income (expense) increased by $1.1 million for the six months ended September 30, 2021 compared to the same period in the previous fiscal year.

Income tax expense (benefit) – The following table presents the effective tax rates for the six months ended September 30, 2021 and 2020

	For the Six Months Ended September 30,
	2021		2020
Effective tax rate	25.8	%	28.1	%

The change in the effective tax rate was primarily due to discrete income tax events related to the stock-based compensation windfall and other items. See “Note 10. Income Taxes” for additional information.

Equity in net income of unconsolidated affiliates - The Equity in net income of unconsolidated affiliates increased for the six months ended September 30, 2021 as compared to the same period in the previous fiscal year due to an increase in the current period income at our South American Joint Venture.

Net income attributable to noncontrolling interest - Net income attributable to noncontrolling interest increased for the six months ended September 30, 2021 due to increased net income at our ADS Mexicana joint venture.

Adjusted EBITDA and Adjusted EBITDA Margin - Adjusted EBITDA and Adjusted EBITDA Margin, which are non-GAAP financial measures, have been presented in this Quarterly Report on Form 10-Q as supplemental measures of financial performance that are not required by, or presented in accordance with GAAP and should not be considered as alternatives to net income as measures of financial performance or cash flows from operations or any other performance measure derived in accordance with GAAP. We calculate Adjusted EBITDA as net income (loss) before interest, income taxes, depreciation and amortization, stock-based compensation expense, non-cash charges and certain other expenses. We calculate Adjusted EBITDA Margin as Adjusted EBITDA divided by net sales.

Adjusted EBITDA and Adjusted EBITDA Margin are included in this Form 10-Q because they are key metrics used by management and our board of directors to assess our consolidated financial performance. These non-GAAP financial measures are frequently used by analysts, investors and other interested parties to evaluate companies in our industry. In addition to covenant compliance and executive performance evaluations, we use these non-GAAP financial measures to supplement GAAP measures of performance to evaluate the effectiveness of our consolidated business strategies, to make budgeting decisions and to compare our performance against that of other peer companies using similar measures. We use Adjusted EBITDA Margin to evaluate our ability to generate profitable sales.

Adjusted EBITDA and Adjusted EBITDA Margin contain certain other limitations, including the failure to reflect our cash expenditures, cash requirements for working capital needs, cash expenditures to replace assets being depreciated and amortized and interest expense, or the cash requirements necessary to service interest on principal payments on our indebtedness. In evaluating Adjusted EBITDA and Adjusted EBITDA Margin, you should be aware that in the future we will incur expenses that are the same as or similar to some of the adjustments in this presentation, such as stock-based compensation expense, derivative fair value adjustments, and foreign currency transaction losses. Management compensates for these limitations by relying on our GAAP results and using non-GAAP measures on a supplemental basis.

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The following table presents a reconciliation of Adjusted EBITDA to Net income, the most comparable GAAP measure, for each of the periods presented.

	Three Months Ended September 30,						Six Months Ended September 30,
	2021			2020			2021			2020
	(In thousands)
Net income	$	76,312		$	80,605		$	153,435		$	151,273
Depreciation and amortization	34,194			35,778			68,850			71,559
Interest expense	8,437			9,360			16,344			19,330
Income tax expense	26,816			31,827			53,271			59,027
EBITDA	145,759			157,570			291,900			301,189
(Gain) loss on disposal of assets and costs from exit and disposal activities	(901)			627			(912)			2,274
ESOP and stock-based compensation expense	17,631			14,626			38,437			27,088
Transaction costs(a)	834			718			877			1,374
Strategic growth and operational improvement initiatives(b)	—			361			—			2,116
COVID-19 related costs(c)	—			242			—			806
Other adjustments(d)	1,481			(70)			1,084			(1,303)
Adjusted EBITDA	$	164,804		$	174,074		$	331,386		$	333,544
Adjusted EBITDA Margin	23.3		%	32.0		%	24.1		%	31.7		%

(a)Represents expenses recorded related to legal, accounting and other professional fees incurred in connection with business or asset acquisitions and dispositions.

(b)Represents professional fees incurred in connection with our strategic growth and operational improvement initiatives, which include various market feasibility assessments and acquisition strategies, along with our operational improvement initiatives, which include evaluation of our manufacturing network and improvement initiatives.

(c)Includes expenses directly related to our response to the COVID-19 pandemic, including adjustments to our pandemic pay program and expenses associated with our third party crisis management vendor.

(d)Includes derivative fair value adjustments, foreign currency transaction (gains) losses, the proportionate share of interest, income taxes, depreciation and amortization related to the South American Joint Venture, which is accounted for under the equity method of accounting and executive retirement expense.

Liquidity and Capital Resources

Historically we have funded our operations through internally generated cash flow supplemented by debt financings, equity issuance and finance and operating leases. These sources have been sufficient historically to fund our primary liquidity requirements, including working capital, capital expenditures, debt service and dividend payments for our convertible preferred stock and common stock. From time to time, we may explore additional financing methods and other means to raise capital. There can be no assurance that any additional financing will be available to us on acceptable terms or at all.

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The following table presents key liquidity metrics utilized by management. The table includes the Non-GAAP measure, Free Cash Flow, which is further discussed and defined below, and Leverage ratio which is calculated as net debt divided by the trailing twelve months Adjusted EBITDA.

	Six Months Ended September 30,
(Amounts in thousands)	2021		2020
Net cash provided by operating activities	$	94,878	$	286,168
Capital expenditures	(63,764)		(28,959)
Free Cash Flow	31,114		257,209
Total debt (debt and finance lease obligations)	961,127
Cash	14,005
Net debt (total debt less cash)	947,122
Leverage Ratio	1.7

Free Cash Flow - Free cash flow is a non-GAAP financial measure that comprises cash flow from operations less capital expenditures. Free cash flow is a measure used by management and our Board of Directors to assess our ability to generate cash. Accordingly, free cash flow has been presented in this Quarterly Report on Form 10-Q as a supplemental measure of liquidity that is not required by, or presented in accordance with GAAP, because management believes that free cash flow provides useful information to investors and others in understanding and evaluating our ability to generate cash flow from operations after capital expenditures.

Free cash flow is not a GAAP measure of our liquidity and should not be considered as an alternative to cash flow from operating activities as a measure of liquidity or any other liquidity measure derived in accordance with GAAP. Our measure of free cash flow is not necessarily comparable to other similarly titled captions of other companies due to different methods of calculation.

Net cash provided by operating activities decreased $191.3 million to $94.9 million, as compared to $286.2 million in the prior year, primarily due to changes in net working capital. Free cash flow (Non-GAAP) decreased $226.1 million to $31.1 million, as compared to $257.2 million in the prior year. Net debt (total debt and finance lease obligations net of cash) was $947.1 million as of September 30, 2021.

The following table summarizes our available liquidity for the periods presented.

(Amounts in thousands)	September 30, 2021
Revolver capacity	$	350,000
Less: outstanding borrowings	(122,600)
Less: letters of credit	(12,505)
Revolver available liquidity	$	214,895

In addition to the available liquidity above, we have the ability to borrow up to $1.3 billion under our Term Loan Facility, subject to leverage ratio restrictions.

Working Capital and Cash Flows

As of September 30, 2021, we had $228.9 million in liquidity, including $14.0 million of cash, $214.9 million in borrowings available under our Revolving Credit Agreement, net of $12.5 million of outstanding letters of credit. We believe that our cash on hand, together with the availability of borrowings under our Credit Agreement and other financing arrangements and cash generated from operations, will be sufficient to meet our working capital requirements, anticipated capital expenditures, scheduled principal and interest payments on our indebtedness and the dividend payment requirement for our convertible preferred stock for at least the next twelve months.

Working Capital - Working capital decreased to $403.7 million as of September 30, 2021, from $424.7 million as of March 31, 2021. The decrease in working capital is primarily due to decreased cash related to share repurchase activity and increased accounts payable and other current liabilities. These decreases were offset by increased inventory and accounts receivable.

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	Six Months Ended September 30,
(Amounts in thousands)	2021		2020
Net cash provided by operating activities	$	94,878	$	286,168
Net cash used in investing activities	(62,208)		(28,504)
Net cash used in financing activities	(213,593)		(227,793)

Operating Cash Flows – Cash flows from operating activities decreased $191.3 million during the six months ended September 30, 2021 was due to changes in net working capital including increased inventory and accounts receivable.

Investing Cash Flows - Cash flows used in investing activities during the six months ended September 30, 2021 increased by $33.7 million compared to the same period in fiscal 2021.

Capital expenditures totaled $63.8 million and $29.0 million for the six months ended September 30, 2021 and 2020, respectively. Our capital expenditures for the six months ended September 30, 2021 were used primarily to support facility expansions, equipment replacements, our recycled resin and technology improvement initiatives.

We currently anticipate that we will make capital expenditures of approximately $130 to $150 million in fiscal year 2022. Such capital expenditures are expected to be financed using funds generated by operations. As of September 30, 2021, there were no material contractual obligations or commitments related to these planned capital expenditures.

Financing Cash Flows - During the six months ended September 30, 2021, cash used included the repurchase of common stock of $292.0 million, repayment of $24.2 million on the Revolving Credit Facility, $13.0 million of shares withheld for tax purposes, $18.8 million of dividend payments and payments on our finance lease obligations of $10.4 million. Cash provided by financing activities included proceeds of $146.8 million on the Revolving Credit Facility.

During the six months ended September 30, 2020, cash used in financing activities included the repayment of $103.5 million on the Term Loan Facility, the repayment of $100.0 million on the Revolving Credit Facility, quarterly dividend payments of $15.4 million and payments on our finance lease obligations of $12.2 million.

Cash held by Foreign Subsidiaries - As of September 30, 2021, we had $11.9 million in cash that was held by our foreign subsidiaries, including $8.2 million held by our Canadian subsidiaries. We continue to evaluate our strategy regarding foreign cash, but our earnings in foreign subsidiaries still remain indefinitely reinvested, except for Canada. We plan to repatriate earnings from Canada and believe that there will be no additional tax costs associated with the repatriation of such earnings other than any potential non-U.S. withholding taxes.

Employee Stock Ownership Plan (“ESOP”)

The Company established the Advanced Drainage Systems, Inc. ESOP (the “ESOP” or the “Plan”) effective April 1, 1993 to enable eligible employees to acquire stock ownership in ADS in the form of redeemable convertible preferred shares. The Plan was funded by an existing tax-qualified profit-sharing retirement plan, as well as a 30-year term loan from ADS. Within 30 days following the repayment of the ESOP loan, which will occur no later than March 2023, the ESOP committee can direct the shares of redeemable convertible preferred stock owned by the ESOP to be converted into shares of the Company’s common stock.

The Company is obligated to make contributions to the Plan, which, when aggregated with the Plan’s dividends, equal the amount necessary to enable the Plan to make its regularly scheduled payments of principal and interest due on its term loan to ADS. Compensation expense is recognized based upon the average annual fair value of the shares during the period which ADS receives payments on the term loan, and the number of ESOP shares allocated to participant accounts.

As disclosed in “Note 16. Employee Benefit Plans” to the Consolidated Financial Statements included in “Item 8. Financial Statements and Supplementary Data” of our Fiscal 2021 Form 10-K, redeemable convertible preferred stock can convert to common stock upon retirement, disability, death, or vested terminations over the life of the Plan. As stated above, within 30 days following the repayment of the ESOP loan, all redeemable convertible preferred stock will be converted to common stock, which will be no later than March 2023.

The ESOP’s conversion of redeemable convertible preferred stock into common stock will have a meaningful impact on the Company’s net income, net income per share and common shares outstanding. The outstanding shares of common stock would be 20% greater after conversion.

Impact on Net Income - Provided that the converted common stock do not qualify as participating securities, the Company will no longer be required to apply the two-class method to determine Net income per share. In addition, the Company

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would not be required to recognize the fair value of ESOP deferred compensation attributable to the shares of redeemable convertible preferred shares allocated.

The impact of the ESOP on net income includes the fair value of ESOP deferred compensation attributable to the shares of redeemable convertible preferred stock allocated to employee ESOP accounts during the applicable period, which is a non-cash charge to our earnings and not deductible for income tax purposes.

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Net income attributable to ADS	$	75,359	$	80,236	$	151,346	$	150,702
ESOP deferred stock-based compensation	12,013		9,130		26,168		15,993

Impact on Common Stock Outstanding - The repayment of the ESOP loan and related conversion of redeemable convertible preferred shares will have an impact on the number of common shares outstanding. As shares are converted, the number of common shares outstanding will increase.

	Three Months Ended September 30,		Six Months Ended September 30,
	2021	2020	2021	2020
	(Shares in millions)
Weighted average common shares outstanding	70.5	69.8	71.0	69.6
Conversion of redeemable convertible shares	14.1	16.3	14.4	16.4

Financing Transactions

Senior Secured Credit Facility - In July 2019, the Company entered into the Base Credit Agreement by and among the Company, as borrower, Barclays Bank PLC, as administrative agent, the several lenders from time to time party thereto. In September 2019, the Company amended the Base Credit Agreement. The Senior Secured Credit Facility provides the Term Loan Facility in an initial aggregate principal amount of $700 million, the Revolving Credit Facility in an initial aggregate principal amount of up to $350 million, the L/C Facility in the initial aggregate available amount of up to $50 million, as a sublimit of such Revolving Credit Facility and a swing line sub-facility in the aggregate available amount of up to $50 million, as a sublimit of the Revolving Credit Facility. As of September 30, 2021, the outstanding principal drawn on Term Loan Facility was $437.8 million and $122.6 million on the Revolving Credit Facility. The Company had $214.9 million available to be drawn on the Revolving Credit Facility, net of $12.5 million of outstanding letters of credit.

ADS Mexicana Revolving Credit Facility - The Company and ADS Mexicana entered into an Intercompany Revolving Credit Promissory Note (the “Intercompany Note”) with a capacity of $12.0 million on June 22, 2018. The Intercompany Note matures on June 22, 2022. The Intercompany Note indemnifies the ADS Mexicana joint venture partner for 49% of any unpaid borrowing. The interest rates under the Intercompany Note are determined by certain base rates or LIBOR rates plus an applicable margin based on the Leverage Ratio. As of September 30, 2021 and March 31, 2021, there were no borrowings under the Intercompany Note.

Issuance of Senior Notes due 2027 - On September 23, 2019, the Company issued $350.0 million aggregate principal amount of its Senior Notes, pursuant to the Indenture among the Company, the Guarantors and the Trustee. The Senior Notes are guaranteed by each of the Company’s present and future direct and indirect wholly owned domestic subsidiaries that is a guarantor under the Company's Senior Secured Credit Facility. The Senior Notes were offered and sold either to persons reasonably believed to be “qualified institutional buyers” pursuant to Rule 144A under the Securities Act or to persons outside the United States under Regulation S of the Securities Act.

Interest on the Senior Notes will be payable semi-annually in cash in arrears on March 31 and September 30 of each year, commencing on March 31, 2020, at a rate of 5.000% per annum. The Senior Notes will mature on September 30, 2027. The Company used the majority of the net proceeds from the offering of the Senior Notes for the repayment of $300.0 million of its outstanding borrowings under the Company’s Base Credit Agreement.

The Company may redeem the Senior Notes, in whole or in part, at any time on or after September 30, 2022 at established redemption prices. At any time prior to September 30, 2022, the Company may also redeem up to 40% of the Senior Notes with net cash proceeds of certain equity offerings at a redemption price equal to 105.000% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date. In addition, at

- 28 -

any time prior to September 30, 2022, the Company may redeem the Senior Notes, in whole or in part, at a redemption price equal to 100% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date plus an applicable “make-whole” premium.

The Indenture contains customary events of default, including, among other things, payment default, failure to comply with covenants or agreements contained in the Indenture or the Senior Notes and certain provisions related to bankruptcy events. The Indenture also contains customary negative covenants.

Covenant Compliance - The Senior Secured Credit Facility requires, if the aggregate amount of outstanding exposure under the Revolving Facility exceeds $122.5 million at the end of any fiscal quarter, the Company to maintain a consolidated senior secured net leverage ratio (commencing with the fiscal quarter ending March 31, 2020) not to exceed 4.25 to 1.00 for any four consecutive fiscal quarter periods.

The Senior Secured Credit Facility also includes other covenants, including negative covenants that, subject to certain exceptions, limit the Company’s and its restricted subsidiaries’ (as defined in the Credit Agreement) ability to, among other things: (i) incur additional debt, including guarantees; (ii) create liens upon any of their property; (iii) enter into any merger, consolidation or amalgamation, liquidate, wind up or dissolve, or dispose of all or substantially all of their property or business; (iv) dispose of assets; (v) pay subordinated debt; (vi) make certain investments; (vii) enter into swap agreements; (viii) engage in transactions with affiliates; (ix) engage in new lines of business; (x) modify certain material contractual obligations, organizational documents, accounting policies or fiscal year; or (xi) create or permit restrictions on the ability of any subsidiary of any Loan Party (as defined in the Senior Secured Credit Facility) to pay dividends or make distributions to the Company or any of its subsidiaries.

The Senior Secured Credit Facility also contains customary provisions requiring the following mandatory prepayments (subject to certain exceptions and limitations): (i) annual prepayments (beginning with the fiscal year ending March 31, 2021) with a percentage of excess cash flow (as defined in the Senior Secured Credit Facility); (ii) 100% of the net cash proceeds from any non-ordinary course sale of assets and certain casualty or condemnation events; and (iii) 100% of the net cash proceeds of indebtedness not permitted to be incurred under the Senior Secured Credit Facility.

For further information, see “Note 13. Debt” to the Consolidated Financial Statements in our Fiscal 2021 Form 10-K. We are in compliance with our debt covenants as of September 30, 2021.

Off-Balance Sheet Arrangements

Excluding the guarantees of 50% of certain debt of our unconsolidated South American Joint Venture as further discussed in “Note 7. Related Party Transactions” to the Condensed Consolidated Financial Statements, we do not have any other off-balance sheet arrangements. As of September 30, 2021, our South American Joint Venture had approximately $10.1 million of outstanding debt subject to our guarantees. We do not believe that this guarantee will have a current or future effect on our financial condition, results of operations, liquidity, or capital resources.

Critical Accounting Policies and Estimates

There have been no changes in critical accounting policies from those disclosed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our Fiscal 2021 Form 10-K, except as disclosed in "Note 1. Background and Summary of Significant Accounting Policies".

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Forward-Looking Statements

This Quarterly Report on Form 10-Q (“Form 10-Q”) includes forward-looking statements. Some of the forward-looking statements can be identified by the use of terms such as “believes,” “expects,” “may,” “will,” “would,” “should,” “could,” “seeks,” “predict,” “potential,” “continue,” “intends,” “plans,” “projects,” “estimates,” “anticipates” or other comparable terms. These forward-looking statements include all matters that are not related to present facts or current conditions or that are not historical facts. They appear in a number of places throughout this Form 10-Q and include statements regarding our intentions, beliefs or current expectations concerning, among other things, our consolidated results of operations, financial condition, liquidity, prospects, growth strategies, and the industries in which we operate and include, without limitation, statements relating to our future performance.

Forward-looking statements are subject to known and unknown risks and uncertainties, many of which are beyond our control. We caution you that forward-looking statements are not guarantees of future performance and that our actual consolidated results of operations, financial condition, liquidity and industry development may differ materially from those made in or suggested by the forward-looking statements contained in this Quarterly Report on Form 10-Q. In addition, even if our actual consolidated results of operations, financial condition, liquidity and industry development are consistent with the forward-looking statements contained in this Form 10-Q, those results or developments may not be indicative of results or developments in subsequent periods. A number of important factors could cause actual results to differ materially from those contained in or implied by the forward-looking statements, including those reflected in forward-looking statements relating to our operations and business, the risks and uncertainties discussed in this Form 10-Q (including under the headings “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations”), and those described from time to time in our other filings with the SEC. Factors that could cause actual results to differ from those reflected in forward-looking statements relating to our operations and business include:

•fluctuations in the price and availability of resins and other raw materials and our ability to pass any increased costs of raw materials on to our customers in a timely manner;

•volatility in general business and economic conditions in the markets in which we operate, including the adverse impact on the U.S. and global economy of the COVID-19 global pandemic, and the impact of COVID-19 in the near, medium and long-term on our business, results of operations, financial position, liquidity or cash flows, and other limitation factors relating to availability of credit, interest rates, fluctuations in capital and business and consumer confidence;

•cyclicality and seasonality of the non-residential and residential construction markets and infrastructure spending;

•the risks of increasing competition in our existing and future markets, including competition from both manufacturers of high performance thermoplastic corrugated pipe and manufacturers of products using alternative materials, and our ability to continue to convert current demand for concrete, steel and polyvinyl chloride (“PVC”) pipe products into demand for our high performance thermoplastic corrugated pipe and Allied Products;

•uncertainties surrounding the integration and realization of anticipated benefits of acquisitions and similar transactions, including Infiltrator;

•the effect of any claims, litigation, investigations or proceedings, including those described under “Item 3. Legal Proceedings” of this Quarterly Report;

•the effect of weather or seasonality;

•the loss of any of our significant customers;

•the risks of doing business internationally;

•the risks of conducting a portion of our operations through joint ventures;

•our ability to expand into new geographic or product markets, including risks associated with new markets and products associated with our recent acquisition of Infiltrator;

•our ability to achieve the acquisition component of our growth strategy;

•the risk associated with manufacturing processes;

•our ability to manage our assets;

•the risks associated with our product warranties;

•our ability to manage our supply purchasing and customer credit policies;

•our ability to control labor costs and to attract, train and retain highly qualified employees and key personnel;

•our ability to protect our intellectual property rights;

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•changes in laws and regulations, including environmental laws and regulations;

•the risks associated with our current levels of indebtedness, including borrowings under our existing credit agreement and outstanding indebtedness under our existing senior notes;

•fluctuations in our effective tax rate, including from the Tax Cuts and Jobs Act;

•our ability to meet future capital requirements and fund our liquidity needs; and

•other risks and uncertainties, including those listed under “Item 1A. Risk Factors.” in the Fiscal 2021 Form 10-K.

All forward-looking statements are made only as of the date of this report and we do not undertake any obligation, other than as may be required by law, to update or revise any forward-looking statements to reflect future events or developments. Comparisons of results for current and any prior periods are not intended to express any future trends, or indications of future performance, unless expressed as such, and should only be viewed as historical data.

Item 3.         Quantitative and Qualitative Disclosures about Market Risk

We are subject to various market risks, primarily related to changes in interest rates, credit, raw material supply prices and, to a lesser extent, foreign currency exchange rates. Our financial position, results of operations or cash flows may be negatively impacted in the event of adverse movements in the respective market rates or prices in each of these risk categories. Our exposure in each category is limited to those risks that arise in the normal course of business, as we do not engage in speculative, non-operating transactions. Our exposure to market risk has not materially changed from what we previously disclosed in Part II. Item 7A. “Quantitative and Qualitative Disclosures about Market Risk” of our Annual Report on Form 10-K for the fiscal year ended March 31, 2021, except as disclosed below.

Interest Rate Risk - We are subject to interest rate risk associated with our bank debt. Changes in interest rates impact the fair value of our fixed-rate debt, but there is no impact to earnings and cash flow. Alternatively, changes in interest rates do not affect the fair value of our variable-rate debt, but they do affect future earnings and cash flow. The Revolving Credit Facility and the Term Note, notes bear variable interest rates. The Revolving Credit Facility and Term Note bear interest either at LIBOR or the Prime Rate, at our option, plus applicable pricing margins. A 1.0% increase in interest rates on our variable-rate debt would increase our annual forecasted interest expense by approximately $5.4 million based on our borrowings as of September 30, 2020. Assuming the Revolving Credit Facility is fully drawn, each 1.0% increase or decrease in the applicable interest rate would change our interest expense by approximately $9.9 million, for the twelve months ended September 30, 2021.

Item 4.         Controls and Procedures

Evaluation of Disclosure Controls and Procedures

The Company’s Chief Executive Officer (“CEO”) and Chief Financial Officer (“CFO”) are responsible for evaluating the effectiveness of our disclosure controls and procedures as defined in the Securities Exchange Act of 1934, as amended (the “Exchange Act”), rules 13a-15(e) and 15d-15(e). The Company’s disclosure controls and procedures are designed to provide reasonable assurance that the information required to be disclosed in the Company’s reports under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and that such information is accumulated and communicated to management, including the Company’s CEO and CFO, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Based on the evaluation of our disclosure controls and procedures, our CEO and CFO concluded that the Company’s disclosure controls and procedures were effective as of the end of the period covered by this report.

Changes in Internal Control over Financial Reporting

There were no changes in the Company’s internal control over financial reporting as defined in Rules 13a-15(f) and 15d-15(f) of the Exchange Act that occurred during the three months ended September 30, 2021 that has materially affected, or is reasonably likely to materially affect, internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1.         Legal Proceedings

The Company is involved from time to time in various legal proceedings that arise in the ordinary course of business, including but not limited to commercial disputes, environmental matters, employee related claims, intellectual property disputes and litigation in connection with transactions including acquisitions and divestitures. The Company does not believe that such litigation, claims, and administrative proceedings will have a material adverse impact on the Company’s financial position or results of operations.

Please see “Note 9. Commitments and Contingencies,” of the Condensed Consolidated Financial Statements of this Quarterly Report on Form 10-Q for more information regarding legal proceedings.

Item 1A.     Risk Factors

Important risk factors that could affect our operations and financial performance, or that could cause results or events to differ from current expectations, are described in “Part I, Item 1A — Risk Factors” of our Fiscal 2021 Form 10-K. These factors are further supplemented by those discussed in “Part II, Item 7A — Quantitative and Qualitative Disclosures about Market Risk” of our Fiscal 2021 Form 10-K and in “Part I, Item 3 — Quantitative and Qualitative Disclosures about Market Risk” and “Part II, Item 1 — Legal Proceedings” of this Quarterly Report on Form 10-Q.

Item 2.        Unregistered Sale of Equity Securities and Use of Proceeds

In May 2021, our Board of Directors authorized a $250 million increase to our existing $50 million stock repurchase program. Repurchase of common stock will be made in accordance with applicable securities laws. The Company repurchased 1.5 million shares of common stock at a cost of $176.7 million during the three months ended September 30, 2021. The stock repurchase program does not obligate us to acquire any particular amount of common stock and may be suspended or terminated at any time at our discretion.

The following table provides information with respect to repurchases of our common stock by us and our “affiliated purchasers” (as defined by Rule 10b-18(a)(3) under the Exchange Act) during the three months ended September 30, 2021:

Period	Total Number of Shares Purchased	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plan	Approximate Dollar Value of Shares that May Yet be Purchased Under the Plan
(amounts in thousands, except per share data)
July 1, 2021 to July 31, 2021	1,080	$	116.46	1,080	50,895
August 1, 2021 to August 30, 2021	438	116.08		438	—
September 1, 2021 to September 30, 2021	—	—		—	—
Total	1,518	$	116.35	1,518	$	—

Item 3.        Defaults Upon Senior Securities

None.

Item 4.        Mine Safety Disclosures

Not applicable.

Item 5.        Other Information

None.

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Item 6. Exhibits

The following exhibits are filed herewith or incorporated herein by reference.

Exhibit Number	Exhibit Description
4.1	Shareholder Agreement, dated as of August 19, 2021, by and between Advanced Drainage Systems, Inc. and Canada Pension Plan Investment Board (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K (File No. 001-36557) filed with the Securities and Exchange Commission on August 20, 2021).
4.2	Registration Rights Agreement, dated as of August 19, 2021, by and between Advanced Drainage Systems, Inc. and Canada Pension Plan Investment Board (incorporated by reference to Exhibit 10.2 to the Registrant’s Current Report on Form 8-K (File No. 001-36557) filed with the Securities and Exchange Commission on August 20, 2021).
10.1	First Amendment to Advanced Drainage Systems, Inc. 2017 Omnibus Incentive Plan (incorporated by reference to Annex A to the Registrant’s 2021 Proxy Statement (File No. 001-36557) filed with the Securities and Exchange Commission on June 9, 2021).
10.2	Separation and Release Agreement, dated as of September 1, 2021, by and between Advanced Drainage Systems, Inc. and Ronald R. Vitarelli (incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K (File No. 001-36557) filed with the Securities and Exchange Commission on September 8, 2021).
31.1*	Certification of President and Chief Executive Officer of Advanced Drainage Systems, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2*	Certification of Executive Vice President and Chief Financial Officer of Advanced Drainage Systems, Inc. pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1*	Certification of Principal Executive Officer of Advanced Drainage Systems, Inc. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2*	Certification of Principal Financial Officer of Advanced Drainage Systems, Inc. pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	Inline XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH*	Inline XBRL Taxonomy Extension Schema.
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase.
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase.
101.LAB*	Inline XBRL Taxonomy Extension Label Linkbase.
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase.
104	The cover page for the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, has been formatted in Inline XBRL and contained in Exhibit 101..

* Filed herewith

- 33 -

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date: November 5, 2021

ADVANCED DRAINAGE SYSTEMS, INC.
By:	/s/ D. Scott Barbour
	D. Scott Barbour
	President and Chief Executive Officer
	(Principal Executive Officer)
By:	/s/ Scott A. Cottrill
	Scott A. Cottrill
	Executive Vice President, Chief Financial Officer and Secretary
	(Principal Financial Officer)
By:	/s/ Tim A. Makowski
	Tim A. Makowski
	Vice President, Controller, and Chief Accounting Officer

- 34 -

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

I, D. Scott Barbour, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q (this “Report”) of the registrant, Advanced Drainage Systems, Inc.;

2.Based on my knowledge, this Report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Report;

3.Based on my knowledge, the financial statements and other financial information included in this Report fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this Report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this Report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this Report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this Report based on such evaluation; and

d.Disclosed in this Report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 5, 2021

By:	/s/ D. Scott Barbour
D. Scott Barbour
President and Chief Executive Officer
(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

I, Scott A. Cottrill, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q (this “Report”) of the registrant, Advanced Drainage Systems, Inc.;

2.Based on my knowledge, this Report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this Report;

3.Based on my knowledge, the financial statements and other financial information included in this Report fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this Report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15(d)-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this Report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this Report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this Report based on such evaluation; and

d.Disclosed in this Report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 5, 2021

By:	/s/ Scott A. Cottrill
Scott A. Cottrill
Executive Vice President,
Chief Financial Officer and
Secretary
(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned hereby certifies, pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, and in accordance with 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in his capacity as the principal executive officer of Advanced Drainage Systems, Inc. (the “Company”), that, to the best of his knowledge, the Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2021 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods presented in the financial statements included in such report.

November 5, 2021

/s/ D. Scott Barbour

D. Scott Barbour

President and Chief Executive Officer

(Principal Executive Officer)

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate document. A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

The undersigned hereby certifies, pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, and in accordance with 18 U.S.C. 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, in his capacity as the principal financial officer of Advanced Drainage Systems, Inc. (the “Company”), that, to the best of his knowledge, the Quarterly Report on Form 10-Q of the Company for the quarter ended September 30, 2021 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and that the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company as of the dates and for the periods presented in the financial statements included in such report.

November 5, 2021

/s/ Scott A. Cottrill

Scott A. Cottrill

Chief Financial Officer

(Principal Financial Officer)

The foregoing certification is being furnished solely pursuant to 18 U.S.C. Section 1350 and is not being filed as part of the Report or as a separate document. A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

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Cover - shares	6 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-36557
Entity Registrant Name	ADVANCED DRAINAGE SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	51-0105665
Entity Address, Address Line One	4640 Trueman Boulevard
Entity Address, City or Town	Hilliard
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	43026
City Area Code	614
Local Phone Number	658-0050
Title of each class	Common Stock, $0.01 par value per share
Trading Symbol(s)	WMS
Name of each exchange on which registered	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		71,241,663
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Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
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Current Fiscal Year End Date	--03-31

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Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Current assets:
Cash	$ 14,005	$ 195,009
Receivables (less allowance for doubtful accounts of $8,068 and $5,323, respectively)	361,466	236,191
Inventories	425,244	300,961
Other current assets	16,858	10,817
Total current assets	817,573	742,978
Property, plant and equipment, net	544,187	504,275
Other assets:
Goodwill	598,976	599,072
Intangible assets, net	450,925	482,016
Other assets	94,963	85,491
Total assets	2,506,624	2,413,832
Current liabilities:
Current maturities of debt obligations	7,000	7,000
Current maturities of finance lease obligations	17,467	19,318
Accounts payable	257,576	171,098
Other accrued liabilities	129,818	116,151
Accrued income taxes	1,978	4,703
Total current liabilities	413,839	318,270
Long-term debt obligations (less unamortized debt issuance costs of $1,839 and $2,030, respectively)	901,511	782,220
Long-term finance lease obligations	35,149	32,964
Deferred tax liabilities	163,238	162,185
Other liabilities	61,366	54,767
Total liabilities	1,575,103	1,350,406
Commitments and contingencies (see Note 9)
Mezzanine equity:
Redeemable convertible preferred stock: $0.01 par value; 47,070 shares authorized; 44,170 shares issued; 18,282 and 19,275 shares outstanding, respectively	228,532	240,944
Deferred compensation – unearned ESOP shares	(7,014)	(11,033)
Total mezzanine equity	221,518	229,911
Stockholders’ equity:
Common stock; $0.01 par value: 1,000,000 shares authorized; 73,333 and 72,071 shares issued, respectively; 70,137 and 71,570 shares outstanding, respectively	11,590	11,578
Paid-in capital	968,198	918,587
Common stock in treasury, at cost	(315,935)	(10,959)
Accumulated other comprehensive loss	(26,020)	(24,220)
Retained earnings (deficit)	57,386	(75,202)
Total ADS stockholders’ equity	695,219	819,784
Noncontrolling interest in subsidiaries	14,784	13,731
Total stockholders’ equity	710,003	833,515
Total liabilities, mezzanine equity and stockholders’ equity	$ 2,506,624	$ 2,413,832

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Allowance for doubtful accounts	$ 8,068	$ 5,323
Unamortized debt issuance costs	$ 1,839	$ 2,030
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	73,333,000	72,071,000
Common stock, shares outstanding	70,137,000	71,570,000
Redeemable Convertible Preferred Stock
Mezzanine equity, par value	$ 0.01	$ 0.01
Mezzanine equity, shares authorized	47,070,000	47,070,000
Mezzanine equity, shares issued	44,170,000	44,170,000
Mezzanine equity, shares outstanding	18,282,000	19,275,000

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Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 706,471	$ 544,187	$ 1,375,771	$ 1,052,826
Cost of goods sold	506,414	338,330	974,593	658,466
Gross profit	200,057	205,857	401,178	394,360
Operating expenses:
Selling, general and administrative	73,951	65,701	150,172	127,477
(Gain) loss on disposal of assets and costs from exit and disposal activities	(901)	627	(912)	2,274
Intangible amortization	15,446	17,955	31,091	35,937
Income from operations	111,561	121,574	220,827	228,672
Other expense:
Interest expense	8,437	9,360	16,344	19,330
Derivative (gains) loss and other (income) expense, net	202	(151)	(1,812)	(718)
Income before income taxes	102,922	112,365	206,295	210,060
Income tax expense	26,816	31,827	53,271	59,027
Equity in net income of unconsolidated affiliates	(206)	(67)	(411)	(240)
Net income	76,312	80,605	153,435	151,273
Less: net income attributable to noncontrolling interest	953	369	2,089	571
Net income attributable to ADS	$ 75,359	$ 80,236	$ 151,346	$ 150,702
Weighted average common shares outstanding:
Basic (in shares)	70,464	69,843	70,993	69,612
Diluted (in shares)	71,924	70,755	72,614	70,459
Net income per share:
Basic (in dollars per share)	$ 0.90	$ 0.95	$ 1.78	$ 1.78
Diluted (in dollars per share)	$ 0.88	$ 0.93	$ 1.74	$ 1.76

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Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 76,312	$ 80,605	$ 153,435	$ 151,273
Currency translation (loss) gain	(3,406)	2,406	(1,365)	5,556
Comprehensive income	72,906	83,011	152,070	156,829
Less: other comprehensive (loss) income attributable to noncontrolling interest	(180)	338	435	657
Less: net income attributable to noncontrolling interest	953	369	2,089	571
Total comprehensive income attributable to ADS	$ 72,133	$ 82,304	$ 149,546	$ 155,601

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash Flows from Operating Activities
Net income	$ 153,435	$ 151,273
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	68,850	71,559
Deferred income taxes	15	(3,446)
(Gain) loss on disposal of assets and costs from exit and disposal activities	(912)	2,274
ESOP and stock-based compensation	38,437	27,088
Amortization of deferred financing charges	191	197
Fair market value adjustments to derivatives	(446)	(1,455)
Equity in net income of unconsolidated affiliates	(411)	(240)
Other operating activities	441	(236)
Changes in working capital:
Receivables	(138,063)	(60,106)
Inventories	(124,429)	60,663
Prepaid expenses and other current assets	(6,738)	(3,666)
Accounts payable, accrued expenses, and other liabilities	104,508	42,263
Net cash provided by operating activities	94,878	286,168
Cash Flows from Investing Activities
Capital expenditures	(63,764)	(28,959)
Other investing activities	1,556	455
Net cash used in investing activities	(62,208)	(28,504)
Cash Flows from Financing Activities
Payments on syndicated Term Loan Facility	(3,500)	(103,500)
Proceeds from Revolving Credit Agreement	146,800	0
Payments on Revolving Credit Agreement	(24,200)	(100,000)
Payments on finance lease obligations	(10,437)	(10,677)
Repurchase of common stock	(292,000)	0
Cash dividends paid	18,758	15,402
Dividends paid to noncontrolling interest holder	(1,471)	0
Proceeds from exercise of stock options	3,179	3,275
Payment of withholding taxes on vesting of restricted stock units	(12,976)	0
Other financing activities	(230)	(1,489)
Net cash used in financing activities	(213,593)	(227,793)
Effect of exchange rate changes on cash	(81)	(221)
Net change in cash	(181,004)	29,650
Cash at beginning of period	195,009	174,233
Cash at end of period	14,005	203,883
SUPPLEMENTAL CASH FLOW INFORMATION
Cash paid for income taxes	61,813	39,213
Cash paid for interest	15,383	20,923
Non-cash operating, investing and financing activities:
Acquisition of property, plant and equipment under finance lease and incurred lease obligations	11,403	2,719
Balance in accounts payable for the acquisition of property, plant and equipment	$ 11,499	$ 4,100

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Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Total ADS Stockholders' Equity	Total ADS Stockholders' Equity Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Paid-In Capital	Common Stock in Treasury	Accumulated Other Comprehensive Loss	Retained (Deficit) Earnings	Retained (Deficit) Earnings Cumulative Effect, Period of Adoption, Adjustment	Non-controlling Interest in Subsidiaries
Beginning balance (in shares) at Mar. 31, 2020					69,810		491
Beginning balance at Mar. 31, 2020	$ 537,485	$ (779)	$ 525,723	$ (779)	$ 11,555	$ 827,573	$ (10,461)	$ (35,325)	$ (267,619)	$ (779)	$ 11,762
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	151,273		150,702						150,702		571
Other comprehensive income	5,556		4,899					4,899			657
Redeemable convertible preferred stock dividends	(2,695)		(2,695)						(2,695)
Common stock dividends	(12,620)		(12,620)						(12,620)
Allocation of ESOP shares to participants for compensation	10,340		10,340			10,340
Exercise of common stock options (in shares)					152
Exercise of common stock options	3,277		3,277		$ 2	3,275
Restricted stock awards (in shares)					130		9
Restricted stock awards	(397)		(397)		$ 1		$ (398)
Stock-based compensation expense	11,095		11,095			11,095
ESOP distribution in common stock (in shares)					410
ESOP distribution in common stock	6,657		6,657		$ 4	6,653
Other	318		318			318
Ending balance (in shares) at Sep. 30, 2020					70,502		500
Ending balance at Sep. 30, 2020	$ 709,510		696,520		$ 11,562	859,254	$ (10,859)	(30,426)	(133,011)		12,990
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Beginning balance (in shares) at Jun. 30, 2020					69,973		500
Beginning balance at Jun. 30, 2020	$ 614,589		602,306		$ 11,557	839,765	$ (10,853)	(32,494)	(205,669)		12,283
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	80,605		80,236						80,236		369
Other comprehensive income	2,406		2,068					2,068			338
Redeemable convertible preferred stock dividends	(1,329)		(1,329)						(1,329)
Common stock dividends	(6,249)		(6,249)						(6,249)
Allocation of ESOP shares to participants for compensation	6,304		6,304			6,304
Exercise of common stock options (in shares)					59
Exercise of common stock options	1,037		1,037		$ 1	1,036
Restricted stock awards (in shares)					60
Restricted stock awards	(6)		(6)				$ (6)
Stock-based compensation expense	5,496		5,496			5,496
ESOP distribution in common stock (in shares)					410
ESOP distribution in common stock	6,657		6,657		$ 4	6,653
Ending balance (in shares) at Sep. 30, 2020					70,502		500
Ending balance at Sep. 30, 2020	709,510		696,520		$ 11,562	859,254	$ (10,859)	(30,426)	(133,011)		12,990
Beginning balance (in shares) at Mar. 31, 2021					72,071		501
Beginning balance at Mar. 31, 2021	833,515		819,784		$ 11,578	918,587	$ (10,959)	(24,220)	(75,202)		13,731
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	153,435		151,346						151,346		2,089
Other comprehensive income	(1,365)		(1,800)					(1,800)			435
Redeemable convertible preferred stock dividends	(3,097)		(3,097)						(3,097)
Common stock dividends	(15,661)		(15,661)						(15,661)
Dividends paid to noncontrolling interest holder	$ (1,471)										(1,471)
Share repurchases (in shares)	2,600						2,574
Share repurchases	$ (292,000)		(292,000)				$ (292,000)
Allocation of ESOP shares to participants for compensation	22,149		22,149			22,149
Exercise of common stock options (in shares)					124
Exercise of common stock options	3,180		3,180		$ 1	3,179
Restricted stock awards (in shares)					129		29
Restricted stock awards	(3,230)		(3,230)		$ 1		$ (3,231)
Performance-based restricted stock units (in shares)					245		92
Performance-based restricted stock units	(9,743)		(9,743)		$ 2		$ (9,745)
Stock-based compensation expense	12,269		12,269			12,269
ESOP distribution in common stock (in shares)					764
ESOP distribution in common stock	12,412		12,412		$ 8	12,404
Other	(390)		(390)			(390)
Ending balance (in shares) at Sep. 30, 2021					73,333		3,196
Ending balance at Sep. 30, 2021	$ 710,003		695,219		$ 11,590	968,198	$ (315,935)	(26,020)	57,386		14,784
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible Enumeration]	Accounting Standards Update 2016-13 [Member]
Beginning balance (in shares) at Jun. 30, 2021					73,227		1,678
Beginning balance at Jun. 30, 2021	$ 806,304		791,779		$ 11,589	950,963	$ (139,313)	(22,794)	(8,666)		14,525
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	76,312		75,359						75,359		953
Other comprehensive income	(3,406)		(3,226)					(3,226)			(180)
Redeemable convertible preferred stock dividends	(1,547)		(1,547)						(1,547)
Common stock dividends	(7,760)		(7,760)						(7,760)
Dividends paid to noncontrolling interest holder	$ (514)										(514)
Share repurchases (in shares)	1,500						1,518
Share repurchases	$ (176,622)		(176,622)				$ (176,622)
Allocation of ESOP shares to participants for compensation	10,085		10,085			10,085
Exercise of common stock options (in shares)					76
Exercise of common stock options	1,844		1,844		$ 1	1,843
Restricted stock awards (in shares)					30
Restricted stock awards	0		0
Stock-based compensation expense	5,618		5,618			5,618
Other	(311)		(311)			(311)
Ending balance (in shares) at Sep. 30, 2021					73,333		3,196
Ending balance at Sep. 30, 2021	$ 710,003		$ 695,219		$ 11,590	$ 968,198	$ (315,935)	$ (26,020)	$ 57,386		$ 14,784

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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Stockholders' Equity [Abstract]
Common stock dividends per share	$ 0.11	$ 0.09	$ 0.22	$ 0.18

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Condensed Consolidated Statements of Mezzanine Equity - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Convertible Preferred Stock	Deferred Compensation - Unearned ESOP Shares	Total Mezzanine Equity
Beginning Balance, Shares at Mar. 31, 2020		21,562	1,850
Beginning Balance, Value at Mar. 31, 2020		$ 269,529	$ (22,432)	$ 247,097
Increase (Decrease) in Temporary Equity [Roll Forward]
Allocation of ESOP shares to participants for compensation (in shares)			(452)
Allocation of ESOP shares to participants for compensation	$ 10,340		$ 5,653	5,653
ESOP distribution in common stock, Shares		532
ESOP distribution in common stock		$ (6,657)		(6,657)
Ending Balance, Shares at Sep. 30, 2020		21,030	1,398
Ending Balance, Value at Sep. 30, 2020		$ 262,872	$ (16,779)	246,093
Beginning Balance, Shares at Jun. 30, 2020		21,562	1,624
Beginning Balance, Value at Jun. 30, 2020		$ 269,529	$ (19,605)	249,924
Increase (Decrease) in Temporary Equity [Roll Forward]
Allocation of ESOP shares to participants for compensation (in shares)			(226)
Allocation of ESOP shares to participants for compensation	6,304		$ 2,826	2,826
ESOP distribution in common stock, Shares		(532)
ESOP distribution in common stock		$ (6,657)		(6,657)
Ending Balance, Shares at Sep. 30, 2020		21,030	1,398
Ending Balance, Value at Sep. 30, 2020		$ 262,872	$ (16,779)	246,093
Beginning Balance, Shares at Mar. 31, 2021		19,275	966
Beginning Balance, Value at Mar. 31, 2021	229,911	$ 240,944	$ (11,033)	229,911
Increase (Decrease) in Temporary Equity [Roll Forward]
Allocation of ESOP shares to participants for compensation (in shares)			(322)
Allocation of ESOP shares to participants for compensation	22,149		$ 4,019	4,019
ESOP distribution in common stock, Shares		(993)
ESOP distribution in common stock		$ (12,412)		(12,412)
Ending Balance, Shares at Sep. 30, 2021		18,282	644
Ending Balance, Value at Sep. 30, 2021	221,518	$ 228,532	$ (7,014)	221,518
Beginning Balance, Shares at Jun. 30, 2021		18,282	799
Beginning Balance, Value at Jun. 30, 2021		$ 228,532	$ (8,942)	219,590
Increase (Decrease) in Temporary Equity [Roll Forward]
Allocation of ESOP shares to participants for compensation (in shares)			155
Allocation of ESOP shares to participants for compensation	10,085		$ 1,928	1,928
Ending Balance, Shares at Sep. 30, 2021		18,282	644
Ending Balance, Value at Sep. 30, 2021	$ 221,518	$ 228,532	$ (7,014)	$ 221,518

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Background and Summary of Significant Accounting Policies

6 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Background and Summary of Significant Accounting Policies

BACKGROUND AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Description of Business - Advanced Drainage Systems, Inc. and subsidiaries (collectively referred to as “ADS” or the “Company”), incorporated in Delaware, designs, manufactures and markets innovative water management solutions in the stormwater and on-site septic waste water industries, providing superior drainage solutions for use in the construction and agriculture marketplace. ADS’s products are used across a broad range of end markets and applications, including non-residential, infrastructure and agriculture applications.

The Company is managed and reports results of operations in three reportable segments: Pipe, Infiltrator Water Technologies Ultimate Holdings, Inc ("Infiltrator") and International. The Company also reports the results of its Allied Products and all other business segments as Allied Products and Other.

Historically, sales of the Company’s products have been higher in the first and second quarters of each fiscal year due to favorable weather and longer daylight conditions accelerating construction activity during these periods. Seasonal variations in operating results may also be impacted by inclement weather conditions, such as cold or wet weather, which can delay projects.

Basis of Presentation - The Company prepares its Condensed Consolidated Financial Statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Condensed Consolidated Balance Sheet as of March 31, 2021 was derived from audited financial statements included in the Annual Report on Form 10-K for the year ended March 31, 2021 (“Fiscal 2021 Form 10-K”). The accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, of a normal recurring nature, necessary to present fairly its financial position as of September 30, 2021 and the results of operations for the three and six months ended September 30, 2021 and cash flows for the six months ended September 30, 2021. The interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the notes thereto, filed in the Company’s Fiscal 2021 Form 10-K.

Principles of Consolidation - The Condensed Consolidated Financial Statements include the Company, its wholly-owned subsidiaries, its majority-owned subsidiaries and variable interest entities (“VIEs”) of which the Company is the primary beneficiary. The Company uses the equity method of accounting for equity investments where it exercises significant influence but does not hold a controlling financial interest. Such investments are recorded in Other assets in the Condensed Consolidated Balance Sheets and the related equity earnings from these investments are included in Equity in net income of unconsolidated affiliates in the Condensed Consolidated Statements of Operations. All intercompany balances and transactions have been eliminated in consolidation.

Certain prior year amounts have been reclassified to conform to the fiscal 2022 presentation.

Recent Accounting Guidance

Recently Adopted Accounting Guidance

Standard	Adoption
ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes	In December 2019, the FASB issued an ASU to simplify the accounting for income taxes by removing certain exceptions to the general principles in ASC 740, Income Taxes and improve the comparability of financial statements. The Company adopted this standard effective April 1, 2021. The Company’s adoption of the standard had no impact on the Company’s Condensed Consolidated Financial Statements.

Except for the pronouncements described above, there have been no new accounting pronouncements issued or adopted since the filing of the Fiscal 2021 Form 10-K that have significance, or potential significance, to the Condensed Consolidated Financial Statements.

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Revenue Recognition

6 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Revenue Recognition

REVENUE RECOGNITIONRevenue Disaggregation - The Company disaggregates net sales by Domestic, International and Infiltrator and further disaggregates Domestic and International by product type, consistent with its reportable segment disclosure. This disaggregation level best depicts how the nature, amount, timing and uncertainty of revenue and cash flows

are affected by economic factors. Refer to “Note 12. Business Segments Information” for the Company’s disaggregation of Net sales by reportable segment.

Contract Balances - The Company recognizes a contract asset representing the Company’s right to recover products upon the receipt of returned products and a contract liability for the customer refund. The following table presents the balance of the Company’s contract asset and liability as of the periods presented:

	September 30, 2021		March 31, 2021
	(In thousands)
Contract asset - product returns	$	1,078	$	694
Refund liability	2,392		1,801

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Leases

6 Months Ended

Sep. 30, 2021

Leases [Abstract]

Leases

LEASES

Nature of the Company’s Leases - The Company has operating and finance leases for plants, yards, corporate offices, tractors, trailers and other equipment. The Company’s leases have remaining terms of less than one year to 30 years. A portion of the Company’s yard leases include an option to extend the leases for up to five years. The Company has included renewal options which are reasonably certain to be exercised in its right-of-use assets and lease liabilities.

Master Lease Agreement – In May 2021, the Company entered into a Master Lease Agreement and an Interim Funding Agreement with Fifth Third Bank, National Association, (“Fifth Third”) to finance its procurement of material handling equipment, trucks and trailers (the “Master Lease Agreement”). The Master Lease Agreement and Interim Funding Agreement have a combined initial capacity of $65.0 million. Financings will either bear interest at a fixed rental amount or at a rate based on the London Interbank Offered Rate plus the applicable margin. As of September 30, 2021, the Company had lease financings of $5.5 million outstanding under the agreements.

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Inventories

6 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

Inventories as of the periods presented consisted of the following:

	September 30, 2021		March 31, 2021
	(In thousands)
Raw materials	$	147,584	$	75,294
Finished goods	277,660		225,667
Total inventories	$	425,244	$	300,961

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Fair Value Measurements and Derivative Transactions

6 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements and Derivative Transactions

FAIR VALUE MEASUREMENTS AND DERIVATIVE TRANSACTIONS

The Company uses commodity options in the form of collars and swaps and has previously used interest rate swaps and foreign currency forward contracts to manage its various exposures to interest rate, commodity price fluctuations and foreign currency exchange rate fluctuations. Mark-to-market adjustments for changes in fair value and contract settlement gains and losses for collars, commodity swaps and foreign currency forward contracts are recorded in the Condensed Consolidated Statements of Operations in Derivative (gains) loss and other (income) expense, net.

When applying fair value principles in the valuation of assets and liabilities, the Company is required to maximize the use of quoted market prices and minimize the use of unobservable inputs. The Company has not changed its valuation techniques used in measuring the fair value of any financial assets or liabilities during the fiscal periods presented. The fair value estimates take into consideration the credit risk of both the Company and its counterparties.

When active market quotes are not available for financial assets and liabilities, the Company uses industry standard valuation models. Where applicable, these models project future cash flows and discount the future amounts to a present value using market-based observable inputs including credit risk, interest rate curves, foreign currency rates and forward and spot prices for currencies. In circumstances where market-based observable inputs are not available, management judgment is used to develop assumptions to estimate fair value.

Recurring Fair Value Measurements - The assets and liabilities carried at fair value as of the periods presented were as follows:

	September 30, 2021
	Total		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Derivative assets – diesel fuel contracts	$	1,715	—	$	1,715	—
Total assets at fair value on a recurring basis	$	1,715	—	$	1,715	—
Liabilities:
Derivative liabilities – diesel fuel contracts	$	107	—	$	107	—
Total liabilities at fair value on a recurring basis	$	107	—	$	107	—

	March 31, 2021
	Total		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Derivative assets – diesel fuel contracts	$	1,194	—	$	1,194	—
Total assets at fair value on a recurring basis	$	1,194	—	$	1,194	—
Liabilities:
Derivative liabilities - diesel fuel contracts	$	32	—	$	32	—
Total liabilities at fair value on a recurring basis	$	32	—	$	32	—

For the six months ended September 30, 2021 and 2020, respectively, there were no transfers in or out of Levels 1, 2 or 3.

The Company recorded net (gains) and net losses on mark-to-market adjustments for changes in the fair value of derivatives contracts as well as net (gains) and net losses on the settlement of derivative contracts as follows:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Diesel fuel option collars	$	229	$	(373)	$	(446)	$	(1,455)
Total net unrealized mark-to-market loss (gains)	$	229	$	(373)	$	(446)	$	(1,455)
Diesel fuel option collars	(752)		477		(1,266)		1,317
Total net realized (gain) loss	$	(752)	$	477	$	(1,266)	$	1,317

Valuation of Debt - The carrying amounts of current financial assets and liabilities approximate fair value because of the immediate or short-term maturity of these items, or in the case of derivative instruments, because they are recorded at fair value. The following table presents the carrying and fair value of the Company’s Senior Notes (as defined below and further discussed in “Note 8. Debt”) for the periods presented:

	September 30, 2021				March 31, 2021
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior Notes	$	365,428	$	350,000	$	367,633	$	350,000

The fair value of the Senior Notes was determined based on a quoted market data for the Company’s Senior Notes. The categorization of the framework used to evaluate the Senior Notes is considered Level 2. The Company believes the carrying amount on the remaining long-term debt, including the Term Loan Facility and Revolving Credit Facility, is not materially different from its fair value as the interest rates and terms of the borrowings are similar to currently available borrowings.

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Net Income Per Share and Stockholders' Equity

6 Months Ended

Sep. 30, 2021

Net Income Per Share And Stockholders Equity [Abstract]

Net Income Per Share and Stockholders' Equity

NET INCOME PER SHARE AND STOCKHOLDERS' EQUITY

The Company is required to apply the two-class method to compute both basic and diluted net income per share. The two-class method is an earnings allocation formula that treats participating securities as having rights to earnings that would otherwise have been available to common stockholders.

The following table presents information necessary to calculate net income per share for the periods presented, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive:

	Three Months Ended September 30,				Six Months Ended September 30,
(In thousands, except per share data)	2021		2020		2021		2020
NET INCOME PER SHARE—BASIC:
Net income attributable to ADS	$	75,359	$	80,236	$	151,346	$	150,702
Adjustments for:
Dividends to participating securities	(1,636)		(1,329)		(3,276)		(2,697)
Net income available to common stockholders and participating securities	73,723		78,907		148,070		148,005
Undistributed income allocated to participating securities	(10,494)		(12,760)		(21,430)		(24,025)
Net income available to common stockholders – Basic	$	63,229	$	66,147	$	126,640	$	123,980
Weighted average number of common shares outstanding – Basic	70,464		69,843		70,993		69,612
Net income per common share – Basic	$	0.90	$	0.95	$	1.78	$	1.78
NET INCOME PER SHARE—DILUTED:
Net income available to common stockholders – Diluted	$	63,229	$	66,147	$	126,640	$	123,980
Weighted average number of common shares outstanding – Basic	70,464		69,843		70,993		69,612
Assumed restricted stock - nonparticipating	223		196		251		185
Assumed exercise of stock options	914		716		928		662
Assumed performance units	323		—		442		—
Weighted average number of common shares outstanding – Diluted	71,924		70,755		72,614		70,459
Net income per common share – Diluted	$	0.88	$	0.93	$	1.74	$	1.76
Potentially dilutive securities excluded as anti-dilutive	13,356		14,892		13,729		15,279

Stockholders’ Equity – During the three and six months ended September 30, 2021, the Company repurchased 1.5 million and 2.6 million shares of common stock, respectively, at a cost of $176.6 million and $292.0 million, respectively. The repurchases were made under the Board of Directors’ authorization in May 2021 to repurchase up to an additional $250 million, in addition to the $42 million previously authorized, of ADS common stock in accordance with applicable securities laws. As of September 30, 2021, the Company has utilized all of the common stock repurchase authorization. The repurchase program does not obligate the Company to acquire any particular amount of common stock and may be suspended or terminated at any time at the Company’s discretion.

On October 1, 2021, ADS completed an ESOP distribution of 1.1 million common shares to participants, which will be recorded in the third quarter of fiscal 2022. The distribution will reduce the balance of Redeemable preferred common stock by $17.6 million and increase Paid-in capital.

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Related Party Transactions

6 Months Ended

Sep. 30, 2021

Related Party Transactions [Abstract]

Related Party Transactions

RELATED PARTY TRANSACTIONS

ADS Mexicana - ADS conducts business in Mexico and Central America through its joint venture ADS Mexicana, S.A. de C.V. (together with its affiliate ADS Corporativo, S.A. de C.V., “ADS Mexicana”). ADS owns 51% of the outstanding stock of ADS Mexicana and consolidates ADS Mexicana for financial reporting purposes.

On June 22, 2018, the Company and ADS Mexicana entered into an Intercompany Revolving Credit Promissory Note (the “Intercompany Note”) with a borrowing capacity of $12.0 million. The Intercompany Note matures on June 22, 2022. The Intercompany Note indemnifies the ADS Mexicana joint venture partner for 49% of any unpaid

borrowing. The interest rates under the Intercompany Note are determined by certain base rates or London Interbank Offered Rate (“LIBOR”) plus an applicable margin based on the Leverage Ratio. As of September 30, 2021 and March 31, 2021, there were no borrowings outstanding under the Intercompany Note.

South American Joint Venture - The Tuberias Tigre - ADS Limitada joint venture (the “South American Joint Venture”) manufactures and sells HDPE corrugated pipe in certain South American markets. ADS owns 50% of the South American Joint Venture. ADS is the guarantor of 50% of the South American Joint Venture’s credit arrangement, and the debt guarantee is shared equally with the joint venture partner. The Company’s maximum potential obligation under this guarantee is $11.0 million as of September 30, 2021. The maximum borrowings permitted under the South American Joint Venture’s credit facility are $22.0 million. The Company does not anticipate any required contributions related to the balance of this credit arrangement. As of September 30, 2021 and March 31, 2021, the outstanding principal balances of the credit facility including letters of credit were $8.9 million and $10.0 million, respectively. As of September 30, 2021, there were no U.S. dollar denominated loans. The weighted average interest rate as of September 30, 2021 was 4.4% on Chilean peso denominated loans.

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Debt

6 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt

DEBT

Long-term debt as of the periods presented consisted of the following:

	September 30, 2021		March 31, 2021
	(In thousands)
Term Loan Facility	$	437,750	$	441,250
Senior Notes	350,000		350,000
Revolving Credit Facility	122,600		—
Total	910,350		791,250
Unamortized debt issuance costs	(1,839)		(2,030)
Current maturities	(7,000)		(7,000)
Long-term debt obligations	$	901,511	$	782,220

Senior Secured Credit Facilities – In July 2019, the Company entered into the credit agreement (the “Base Credit Agreement”) by and among the Company, as borrower, Barclays Bank PLC, as administrative agent, the several lenders from time to time party thereto. In September 2019, the Company amended the Base Credit Agreement (as amended the “Senior Secured Credit Facility”). The Senior Secured Credit Facility provides for a term loan facility in an initial aggregate principal amount of $700 million (the “Term Loan Facility”), a revolving credit facility in an initial aggregate principal amount of up to $350 million (the “Revolving Credit Facility”), a letter of credit sub-facility in the initial aggregate available amount of up to $50 million, as a sublimit of such Revolving Credit Facility (the “L/C Facility”) and a swing line sub-facility in the aggregate available amount of up to $50 million, as a sublimit of the Revolving Credit Facility (together with the Term Loan Facility, the Revolving Credit Facility and the L/C Facility, the “Senior Secured Credit Facility”).

During the six months ended September 30, 2021, the Company received proceeds of $146.8 million from the Revolving Credit Facility and repaid $3.5 million of the Term Loan Facility and $24.2 million of the Revolving Credit Facility. Letters of credit outstanding at September 30, 2021 and March 31, 2021 amount to $12.5 million and $11.0 million, respectively, and reduced the availability of the Revolving Credit Facility.

Senior Notes – On September 23, 2019, the Company issued $350.0 million aggregate principal amount of 5.0% senior notes due 2027 (the “Senior Notes”) pursuant to an Indenture, dated September 23, 2019 (the “Indenture”), among the Company, the guarantors party thereto (the “Guarantors”) and U.S. Bank National Association, as Trustee (the “Trustee”). The Senior Notes are guaranteed by each of the Company’s present and future direct and indirect wholly owned domestic subsidiaries that is a guarantor under the Company's Senior Secured Credit Facility. The Senior Notes were offered and sold either to persons reasonably believed to be “qualified institutional buyers” pursuant to Rule 144A under the Securities Act of 1933 (the “Securities Act”) or to persons outside the United States under Regulation S of the Securities Act.

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Commitments and Contingencies

6 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

COMMITMENTS AND CONTINGENCIES

Purchase Commitments

The Company has historically secured supplies of resin raw material by agreeing to purchase quantities during a future given period at a fixed price. These purchase contracts typically ranged from 1 to 12 months and occur in the ordinary course of business. The Company also enters into equipment purchase contracts with manufacturers. The Company does not have any outstanding purchase commitments as of September 30, 2021.

Litigation and Other Proceedings – The Company is involved from time to time in various legal proceedings that arise in the ordinary course of business, including but not limited to commercial disputes, environmental matters, employee related claims, intellectual property disputes and litigation in connection with transactions including acquisitions and divestitures. The Company does not believe that such litigation, claims, and administrative proceedings will have a material adverse impact on the Company’s financial position or results of operations. The Company records a liability when a loss is considered probable, and the amount can be reasonably estimated.

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Income Taxes	6 Months Ended
	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXESThe Company’s effective tax rate will vary based on a variety of factors, including overall profitability, the geographical mix of income before taxes and related tax rates in jurisdictions where it operates and other one-time charges, as well as the occurrence of discrete events. For the three months ended September 30, 2021 and 2020, the Company utilized an effective tax rate of 26.1% and 28.3%, respectively, to calculate its provision for income taxes. State and local income taxes and the Company’s Employee Stock Ownership Plan (“ESOP”) increased the effective rate for the three months ended September 30, 2021 and 2020. Additionally, discrete income tax benefits related to the stock-based compensation windfall and other items decreased the rate for the three months ended September 30, 2021.For the six months ended September 30, 2021 and 2020, the Company utilized an effective tax rate of 25.8% and 28.1%, respectively,to calculate its provision for income taxes. State and local income taxes and the Company’s ESOP increased the effective rate for the the six months ended September 30, 2021 and 2020. Additionally, discrete income tax benefits related to the stock-based compensation windfall and other items decreased the rate for the six months ended September 30, 2021

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Stock-Based Compensation

6 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

STOCK-BASED COMPENSATION

ADS has several programs for stock-based payments to employees and non-employee members of its Board of Directors, including stock options, performance-based restricted stock units and restricted stock. Equity-classified restricted stock awards are measured based on the grant-date estimated fair value of each award. The Company accounts for all restricted stock granted to Directors as equity-classified awards. The Company recognized stock-based compensation expense in the following line items of the Condensed Consolidated Statements of Operations for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Component of income before income taxes:
Cost of goods sold	$	685	$	565	$	1,319	$	966
Selling, general and administrative expenses	4,933		4,931		10,950		10,129
Total stock-based compensation expense	$	5,618	$	5,496	$	12,269	$	11,095

The following table summarizes stock-based compensation expense by award type for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Stock-based compensation expense:
Stock Options	$	860	$	750	$	1,613	$	1,631
Restricted Stock	1,520		1,344		2,879		2,761
Performance-based Restricted Stock Units	2,773		3,070		6,961		6,054
Non-Employee Directors	465		332		816		649
Total stock-based compensation expense	$	5,618	$	5,496	$	12,269	$	11,095

2017 Omnibus Plan

On May 24, 2017, the Board of Directors approved the 2017 Omnibus Incentive Plan (the “2017 Incentive Plan”) which was approved by the Company’s stockholders on July 17, 2017. The 2017 Incentive Plan provides for the issuance of a maximum of 5.0 million shares of the Company’s common stock for awards made thereunder, which awards may consist of stock options, restricted stock, restricted stock units, stock appreciation rights, phantom stock, cash-based awards, performance awards (which may take the form of performance cash, performance units or performance shares) or other stock-based awards.

Restricted Stock - During the three and six months ended September 30, 2021, the Company granted less than 0.1 million shares and 0.1 million shares of restricted stock with a grant date fair value of $2.0 million and $7.3 million, respectively.

Performance-based Restricted Stock Units ("Performance Units") –During the six months ended September 30, 2021, the Company granted 0.1 million performance share units were granted at a grant date fair value of $5.3 million.

Options - During the six months ended September 30, 2021, The Company granted 0.1 million nonqualified stock options under the 2017 Incentive Plan with a grant date fair value of $4.2 million. The Company estimates the fair value of stock options using a Black-Scholes option-pricing model. The following table summarizes the assumptions used to estimate the fair value of stock-options during the periods presented:

	Six Months Ended September 30, 2021
Common stock price	$105.82
Expected stock price volatility	41.0%
Risk-free interest rate	1.1%
Weighted-average expected option life (years)	6.0
Dividend yield	0.3%

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Business Segments Information

6 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Business Segments Information

BUSINESS SEGMENTS INFORMATION

The Company operates its business in three distinct reportable segments: “Pipe”, “International” and “Infiltrator.” “Allied Products & Other” represents the Company’s Allied Products and all other business segments. “Pipe” and “Allied Products & Other” were previously included as Domestic. The Chief Operating Decision Maker (the “CODM”) evaluates segment reporting based on Net Sales and Segment Adjusted Gross Profit. The Company calculated Segment Adjusted Gross Profit as net sales less costs of goods sold, depreciation and amortization, stock-based compensation and non-cash charges. A measure of assets is not applicable, as segment assets are not regularly reviewed by the CODM for evaluating performance or allocating resources.

Pipe – The Pipe segment manufactures and markets high performance thermoplastic corrugated pipe throughout the United States. The Company maintains and serves these markets through product distribution relationships with many of the largest national and independent waterworks distributors, buying groups and co-ops, major national retailers as well as an extensive network of hundreds of small to medium-sized distributors across the United States.

Products include single wall pipe, N-12 HDPE pipe sold into the Storm sewer, Infrastructure and Agriculture markets, High Performance polypropylene pipe sold into the Storm sewer, Infrastructure and sanitary sewer markets. Products are designed primarily for storm water management in the construction and infrastructure marketplace across a broad range of end markets and applications, including non-residential, residential, agriculture and infrastructure. Products are manufactured using HDPE and polypropylene plastic material.

Infiltrator – Infiltrator is a leading national provider of plastic leach field chambers and systems, septic tanks and accessories, primarily for use in residential applications. Infiltrator products are used in on-site septic wastewater treatment systems in the United States and Canada.

International – The International segment manufactures and markets pipe and allied products in certain regions outside of the United States, including Company owned facilities in Canada, subsidiaries that distribute to Europe and the Middle East, exports and through the Company’s joint ventures with local partners in Mexico and South America. The Company’s Mexican joint venture, ADS Mexicana, primarily serves the Mexican and Central American markets, while its South American Joint Venture, Tigre-ADS, is the primary channel to serve the South American markets. The Company’s International product lines include single wall pipe, N-12 HDPE pipe, high performance PP pipe and certain geographies also sell our broad line of Allied Products.

Allied Products & Other – Allied Products and Other manufactures and markets products throughout the United States. Products include StormTech, Nyloplast, ARC Septic Chambers, Inserta Tee, BaySaver filters and water quality structures, Fittings, and FleXstorm. The Company maintains and serves these markets through product distribution relationships with many of the largest national and independent waterworks distributors, major national retailers as well as an extensive network of hundreds of small to medium-sized distributors across the United States. The Company also sells through a broad variety of buying groups and co-ops in the United States. The Company aggregates operating segments within the Allied Products & Other segment disclosure. None of the operating segments within the Allied Products & Other businesses segment disclosure exceeds the quantitative thresholds for separate segment reporting.

The following table sets forth reportable segment information with respect to the amount of Net sales contributed by each class of similar products for the periods presented:

	Three Months Ended
	September 30, 2021						September 30, 2020
(In thousands)	Net Sales		Intersegment Net Sales		Net Sales from External Customers		Net Sales		Intersegment Net Sales		Net Sales from External Customers
Pipe	$	384,521	$	(2,668)	$	381,853	$	292,133	$	(1,637)	$	290,496
Infiltrator	145,911		(22,412)		123,499		105,986		(18,692)		87,294
International
International - Pipe	50,141		(5,170)		44,971		35,592		(896)		34,696
International - Allied Products & Other	13,433		—		13,433		13,706		—		13,706
Total International	63,574		(5,170)		58,404		49,298		(896)		48,402
Allied Products & Other	145,719		(3,004)		142,715		117,995		—		117,995
Intersegment Eliminations	(33,254)		33,254		—		(21,225)		21,225		—
Total Consolidated	$	706,471	$	—	$	706,471	$	544,187	$	—	$	544,187
	Six Months Ended
	September 30, 2021						September 30, 2020
(In thousands)	Net Sales		Intersegment Net Sales		Net Sales from External Customers		Net Sales		Intersegment Net Sales		Net Sales from External Customers
Pipe	$	758,531	$	(4,571)	$	753,960	$	565,785	$	(3,482)	$	562,303
Infiltrator	272,653		(41,449)		231,204		208,139		(36,760)		171,379
International
International - Pipe	100,979		(8,084)		92,895		62,542		(896)		61,646
International - Allied Products & Other	27,961		—		27,961		22,585		—		22,585
Total International	128,940		(8,084)		120,856		85,127		(896)		84,231
Allied Products & Other	272,755		(3,004)		269,751		234,913		—		234,913
Intersegment Eliminations	(57,108)		57,108		—		(41,138)		41,138		—
Total Consolidated	$	1,375,771	$	—	$	1,375,771	$	1,052,826	$	—	$	1,052,826

The following sets forth certain financial information attributable to the reportable segments for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Segment Adjusted Gross Profit
Pipe	$	82,472	$	100,496	$	166,615	$	191,095
Infiltrator	58,847		53,105		118,249		101,033
International	15,077		14,582		36,455		25,990
Allied Products & Other	67,979		60,380		131,278		120,848
Intersegment Eliminations	1,479		372		1,465		14
Total	$	225,854	$	228,935	$	454,062	$	438,980
Depreciation and Amortization
Pipe	$	12,026	$	11,543	$	24,061	$	22,903
Infiltrator	3,375		3,005		6,811		6,138
International	1,290		1,302		2,748		2,600
Allied Products & Other(a)	17,503		19,928		35,230		39,918
Total	$	34,194	$	35,778	$	68,850	$	71,559
Capital Expenditures
Pipe	$	12,809	$	3,911	$	22,639	$	8,142
Infiltrator	22,134		13,781		35,160		17,979
International	1,264		297		1,514		747
Allied Products & Other(a)	2,011		675		4,451		2,091
Total	$	38,218	$	18,664	$	63,764	$	28,959

(a)Includes depreciation, amortization and capital expenditures not allocated to a reportable segment. The amortization expense of Infiltrator intangible assets acquired is included in Allied Products & Other.

Reconciliation of Gross Profit to Segment Adjusted Gross profit

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Reconciliation of Segment Adjusted Gross Profit:
Total Gross Profit	$	200,057	$	205,857	$	401,178	$	394,360
Depreciation and Amortization	17,250		16,463		34,782		32,886
ESOP and stock-based compensation expense	8,547		6,598		18,102		11,537
COVID-19 related costs(a)	—		17		—		197
Total Segment Adjusted Gross Profit	$	225,854	$	228,935	$	454,062	$	438,980

(a)Includes expenses directly related to our response to the COVID-19 pandemic, including adjustments to our pandemic pay program and expenses associated with our third-party crisis management vendor.

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Subsequent Events	6 Months Ended
	Sep. 30, 2021
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTSCommon Stock Dividend - During the third quarter of fiscal 2022, the Company declared a quarterly cash dividend of $0.11 per share of common stock. The dividend is payable on December 15, 2021 to stockholders of record at the close of business on December 1, 2021.

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Background and Summary of Significant Accounting Policies (Policies)

6 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation - The Company prepares its Condensed Consolidated Financial Statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”). The Condensed Consolidated Balance Sheet as of March 31, 2021 was derived from audited financial statements included in the Annual Report on Form 10-K for the year ended March 31, 2021 (“Fiscal 2021 Form 10-K”). The accompanying unaudited Condensed Consolidated Financial Statements contain all adjustments, of a normal recurring nature, necessary to present fairly its financial position as of September 30, 2021 and the results of operations for the three and six months ended September 30, 2021 and cash flows for the six months ended September 30, 2021. The interim Condensed Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements, including the notes thereto, filed in the Company’s Fiscal 2021 Form 10-K.

Principles of Consolidation

Principles of Consolidation - The Condensed Consolidated Financial Statements include the Company, its wholly-owned subsidiaries, its majority-owned subsidiaries and variable interest entities (“VIEs”) of which the Company is the primary beneficiary. The Company uses the equity method of accounting for equity investments where it exercises significant influence but does not hold a controlling financial interest. Such investments are recorded in Other assets in the Condensed Consolidated Balance Sheets and the related equity earnings from these investments are included in Equity in net income of unconsolidated affiliates in the Condensed Consolidated Statements of Operations. All intercompany balances and transactions have been eliminated in consolidation.

Certain prior year amounts have been reclassified to conform to the fiscal 2022 presentation.

Recent Accounting Guidance

Recent Accounting Guidance

Recently Adopted Accounting Guidance

Standard	Adoption
ASU 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes	In December 2019, the FASB issued an ASU to simplify the accounting for income taxes by removing certain exceptions to the general principles in ASC 740, Income Taxes and improve the comparability of financial statements. The Company adopted this standard effective April 1, 2021. The Company’s adoption of the standard had no impact on the Company’s Condensed Consolidated Financial Statements.

Except for the pronouncements described above, there have been no new accounting pronouncements issued or adopted since the filing of the Fiscal 2021 Form 10-K that have significance, or potential significance, to the Condensed Consolidated Financial Statements.

Leases

Nature of the Company’s Leases - The Company has operating and finance leases for plants, yards, corporate offices, tractors, trailers and other equipment. The Company’s leases have remaining terms of less than one year to 30 years. A portion of the Company’s yard leases include an option to extend the leases for up to five years. The Company has included renewal options which are reasonably certain to be exercised in its right-of-use assets and lease liabilities.

Master Lease Agreement – In May 2021, the Company entered into a Master Lease Agreement and an Interim Funding Agreement with Fifth Third Bank, National Association, (“Fifth Third”) to finance its procurement of material handling equipment, trucks and trailers (the “Master Lease Agreement”). The Master Lease Agreement and Interim Funding Agreement have a combined initial capacity of $65.0 million. Financings will either bear interest at a fixed rental amount or at a rate based on the London Interbank Offered Rate plus the applicable margin. As of September 30, 2021, the Company had lease financings of $5.5 million outstanding under the agreements.

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Revenue Recognition (Tables)

6 Months Ended

Sep. 30, 2021

Revenue from Contract with Customer [Abstract]

Schedule of Contract Asset and Liability

The following table presents the balance of the Company’s contract asset and liability as of the periods presented:

	September 30, 2021		March 31, 2021
	(In thousands)
Contract asset - product returns	$	1,078	$	694
Refund liability	2,392		1,801

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Inventories (Tables)

6 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventories

Inventories as of the periods presented consisted of the following:

	September 30, 2021		March 31, 2021
	(In thousands)
Raw materials	$	147,584	$	75,294
Finished goods	277,660		225,667
Total inventories	$	425,244	$	300,961

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Fair Value Measurement (Tables)

6 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Summary of Assets and Liabilities Carried at Fair Value

The assets and liabilities carried at fair value as of the periods presented were as follows:

	September 30, 2021
	Total		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Derivative assets – diesel fuel contracts	$	1,715	—	$	1,715	—
Total assets at fair value on a recurring basis	$	1,715	—	$	1,715	—
Liabilities:
Derivative liabilities – diesel fuel contracts	$	107	—	$	107	—
Total liabilities at fair value on a recurring basis	$	107	—	$	107	—

	March 31, 2021
	Total		Level 1	Level 2		Level 3
	(In thousands)
Assets:
Derivative assets – diesel fuel contracts	$	1,194	—	$	1,194	—
Total assets at fair value on a recurring basis	$	1,194	—	$	1,194	—
Liabilities:
Derivative liabilities - diesel fuel contracts	$	32	—	$	32	—
Total liabilities at fair value on a recurring basis	$	32	—	$	32	—

Schedule of Derivative Instruments Included in Trading Activities

The Company recorded net (gains) and net losses on mark-to-market adjustments for changes in the fair value of derivatives contracts as well as net (gains) and net losses on the settlement of derivative contracts as follows:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Diesel fuel option collars	$	229	$	(373)	$	(446)	$	(1,455)
Total net unrealized mark-to-market loss (gains)	$	229	$	(373)	$	(446)	$	(1,455)
Diesel fuel option collars	(752)		477		(1,266)		1,317
Total net realized (gain) loss	$	(752)	$	477	$	(1,266)	$	1,317

Summary of Carrying And Fair Value of Senior Notes

The following table presents the carrying and fair value of the Company’s Senior Notes (as defined below and further discussed in “Note 8. Debt”) for the periods presented:

	September 30, 2021				March 31, 2021
	Fair Value		Carrying Value		Fair Value		Carrying Value
	(In thousands)
Senior Notes	$	365,428	$	350,000	$	367,633	$	350,000

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Net Income Per Share and Stockholders' Equity (Tables)

6 Months Ended

Sep. 30, 2021

Net Income Per Share And Stockholders Equity [Abstract]

Summary of Net Income Per Share

The following table presents information necessary to calculate net income per share for the periods presented, as well as potentially dilutive securities excluded from the weighted average number of diluted common shares outstanding because their inclusion would have been anti-dilutive:

	Three Months Ended September 30,				Six Months Ended September 30,
(In thousands, except per share data)	2021		2020		2021		2020
NET INCOME PER SHARE—BASIC:
Net income attributable to ADS	$	75,359	$	80,236	$	151,346	$	150,702
Adjustments for:
Dividends to participating securities	(1,636)		(1,329)		(3,276)		(2,697)
Net income available to common stockholders and participating securities	73,723		78,907		148,070		148,005
Undistributed income allocated to participating securities	(10,494)		(12,760)		(21,430)		(24,025)
Net income available to common stockholders – Basic	$	63,229	$	66,147	$	126,640	$	123,980
Weighted average number of common shares outstanding – Basic	70,464		69,843		70,993		69,612
Net income per common share – Basic	$	0.90	$	0.95	$	1.78	$	1.78
NET INCOME PER SHARE—DILUTED:
Net income available to common stockholders – Diluted	$	63,229	$	66,147	$	126,640	$	123,980
Weighted average number of common shares outstanding – Basic	70,464		69,843		70,993		69,612
Assumed restricted stock - nonparticipating	223		196		251		185
Assumed exercise of stock options	914		716		928		662
Assumed performance units	323		—		442		—
Weighted average number of common shares outstanding – Diluted	71,924		70,755		72,614		70,459
Net income per common share – Diluted	$	0.88	$	0.93	$	1.74	$	1.76
Potentially dilutive securities excluded as anti-dilutive	13,356		14,892		13,729		15,279

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Debt (Tables)

6 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt as of the periods presented consisted of the following:

	September 30, 2021		March 31, 2021
	(In thousands)
Term Loan Facility	$	437,750	$	441,250
Senior Notes	350,000		350,000
Revolving Credit Facility	122,600		—
Total	910,350		791,250
Unamortized debt issuance costs	(1,839)		(2,030)
Current maturities	(7,000)		(7,000)
Long-term debt obligations	$	901,511	$	782,220

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Stock-Based Compensation (Tables)

6 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock-based Compensation Expense

The Company recognized stock-based compensation expense in the following line items of the Condensed Consolidated Statements of Operations for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Component of income before income taxes:
Cost of goods sold	$	685	$	565	$	1,319	$	966
Selling, general and administrative expenses	4,933		4,931		10,950		10,129
Total stock-based compensation expense	$	5,618	$	5,496	$	12,269	$	11,095

The following table summarizes stock-based compensation expense by award type for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Stock-based compensation expense:
Stock Options	$	860	$	750	$	1,613	$	1,631
Restricted Stock	1,520		1,344		2,879		2,761
Performance-based Restricted Stock Units	2,773		3,070		6,961		6,054
Non-Employee Directors	465		332		816		649
Total stock-based compensation expense	$	5,618	$	5,496	$	12,269	$	11,095

Summary of Assumption Used to Estimate Fair Value of Stock Options

The following table summarizes the assumptions used to estimate the fair value of stock-options during the periods presented:

	Six Months Ended September 30, 2021
Common stock price	$105.82
Expected stock price volatility	41.0%
Risk-free interest rate	1.1%
Weighted-average expected option life (years)	6.0
Dividend yield	0.3%

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Business Segments Information (Tables)

6 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Schedule of Revenue from Reportable Segments by Product Type

The following table sets forth reportable segment information with respect to the amount of Net sales contributed by each class of similar products for the periods presented:

	Three Months Ended
	September 30, 2021						September 30, 2020
(In thousands)	Net Sales		Intersegment Net Sales		Net Sales from External Customers		Net Sales		Intersegment Net Sales		Net Sales from External Customers
Pipe	$	384,521	$	(2,668)	$	381,853	$	292,133	$	(1,637)	$	290,496
Infiltrator	145,911		(22,412)		123,499		105,986		(18,692)		87,294
International
International - Pipe	50,141		(5,170)		44,971		35,592		(896)		34,696
International - Allied Products & Other	13,433		—		13,433		13,706		—		13,706
Total International	63,574		(5,170)		58,404		49,298		(896)		48,402
Allied Products & Other	145,719		(3,004)		142,715		117,995		—		117,995
Intersegment Eliminations	(33,254)		33,254		—		(21,225)		21,225		—
Total Consolidated	$	706,471	$	—	$	706,471	$	544,187	$	—	$	544,187
	Six Months Ended
	September 30, 2021						September 30, 2020
(In thousands)	Net Sales		Intersegment Net Sales		Net Sales from External Customers		Net Sales		Intersegment Net Sales		Net Sales from External Customers
Pipe	$	758,531	$	(4,571)	$	753,960	$	565,785	$	(3,482)	$	562,303
Infiltrator	272,653		(41,449)		231,204		208,139		(36,760)		171,379
International
International - Pipe	100,979		(8,084)		92,895		62,542		(896)		61,646
International - Allied Products & Other	27,961		—		27,961		22,585		—		22,585
Total International	128,940		(8,084)		120,856		85,127		(896)		84,231
Allied Products & Other	272,755		(3,004)		269,751		234,913		—		234,913
Intersegment Eliminations	(57,108)		57,108		—		(41,138)		41,138		—
Total Consolidated	$	1,375,771	$	—	$	1,375,771	$	1,052,826	$	—	$	1,052,826

Schedule of Financial Information Attributable to Reportable Segments

The following sets forth certain financial information attributable to the reportable segments for the periods presented:

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Segment Adjusted Gross Profit
Pipe	$	82,472	$	100,496	$	166,615	$	191,095
Infiltrator	58,847		53,105		118,249		101,033
International	15,077		14,582		36,455		25,990
Allied Products & Other	67,979		60,380		131,278		120,848
Intersegment Eliminations	1,479		372		1,465		14
Total	$	225,854	$	228,935	$	454,062	$	438,980
Depreciation and Amortization
Pipe	$	12,026	$	11,543	$	24,061	$	22,903
Infiltrator	3,375		3,005		6,811		6,138
International	1,290		1,302		2,748		2,600
Allied Products & Other(a)	17,503		19,928		35,230		39,918
Total	$	34,194	$	35,778	$	68,850	$	71,559
Capital Expenditures
Pipe	$	12,809	$	3,911	$	22,639	$	8,142
Infiltrator	22,134		13,781		35,160		17,979
International	1,264		297		1,514		747
Allied Products & Other(a)	2,011		675		4,451		2,091
Total	$	38,218	$	18,664	$	63,764	$	28,959

(a)Includes depreciation, amortization and capital expenditures not allocated to a reportable segment. The amortization expense of Infiltrator intangible assets acquired is included in Allied Products & Other.

Reconciliation of Gross Profit to Segment Adjusted Gross Profit

Reconciliation of Gross Profit to Segment Adjusted Gross profit

	Three Months Ended September 30,				Six Months Ended September 30,
	2021		2020		2021		2020
	(In thousands)
Reconciliation of Segment Adjusted Gross Profit:
Total Gross Profit	$	200,057	$	205,857	$	401,178	$	394,360
Depreciation and Amortization	17,250		16,463		34,782		32,886
ESOP and stock-based compensation expense	8,547		6,598		18,102		11,537
COVID-19 related costs(a)	—		17		—		197
Total Segment Adjusted Gross Profit	$	225,854	$	228,935	$	454,062	$	438,980

(a)Includes expenses directly related to our response to the COVID-19 pandemic, including adjustments to our pandemic pay program and expenses associated with our third-party crisis management vendor.

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Background and Summary of Significant Accounting Policies - Additional Information (Detail)	6 Months Ended
	Sep. 30, 2021 segment
Accounting Policies [Abstract]
Number of reportable segments	3
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect	false

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Revenue Recognition - Schedule of Contract Asset and Liability (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Revenue from Contract with Customer [Abstract]
Contract asset - product returns	$ 1,078	$ 694
Refund liability	$ 2,392	$ 1,801

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Leases - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2021	May 31, 2021
Lessee Lease Description [Line Items]
Unused borrowing capacity of lease		$ 65.0
Line of credit	$ 5.5
Minimum
Lessee Lease Description [Line Items]
Leases remaining term	1 year
Maximum
Lessee Lease Description [Line Items]
Leases remaining term	30 years
Maximum | Yard
Lessee Lease Description [Line Items]
Leases options to extend	5 years

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Inventories - Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Inventory Disclosure [Abstract]
Raw materials	$ 147,584	$ 75,294
Finished goods	277,660	225,667
Total inventories	$ 425,244	$ 300,961

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Fair Value Measurement - Summary of Assets and Liabilities Carried at Fair Value (Detail) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
ASSETS
Total assets at fair value on a recurring basis	$ 1,715	$ 1,194
Liabilities [Abstract]
Total liabilities at fair value on a recurring basis	107	32
Level 2
ASSETS
Total assets at fair value on a recurring basis	1,715	1,194
Liabilities [Abstract]
Total liabilities at fair value on a recurring basis	107	32
Diesel Fuel Contracts
ASSETS
Derivative assets – diesel fuel contracts	1,715	1,194
Liabilities [Abstract]
Derivative liabilities – diesel fuel contracts	107	32
Diesel Fuel Contracts | Level 2
ASSETS
Derivative assets – diesel fuel contracts	1,715	1,194
Liabilities [Abstract]
Derivative liabilities – diesel fuel contracts	$ 107	$ 32

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Fair Value Measurement - Additional Information (Detail) - USD ($)	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair value of assets and liabilities, additional transfers	$ 0	$ 0

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Derivative Transactions - Schedule of Cash Settlements and Net (Gains) and Net Losses on Mark-to-Market Adjustments for Changes in Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Derivatives, Fair Value [Line Items]
Total net unrealized mark-to-market loss (gains)	$ 229	$ (373)	$ (446)	$ (1,455)
Total net realized (gain) loss	(752)	477	(1,266)	1,317
Diesel fuel option collars
Derivatives, Fair Value [Line Items]
Total net unrealized mark-to-market loss (gains)	229	(373)	(446)	(1,455)
Total net realized (gain) loss	$ (752)	$ 477	$ (1,266)	$ 1,317

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Fair Value Measurement - Summary of Carrying And Fair Value of Senior Notes (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Reported Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	$ 350,000	$ 350,000
Estimate of Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	$ 365,428	$ 367,633

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Net Income Per Share and Stockholders' Equity - Summary of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
NET INCOME PER SHARE—BASIC:
Net income attributable to ADS	$ 75,359	$ 80,236	$ 151,346	$ 150,702
Adjustments for:
Dividends to participating securities	(1,636)	(1,329)	(3,276)	(2,697)
Net income available to common stockholders and participating securities	73,723	78,907	148,070	148,005
Undistributed income allocated to participating securities	(10,494)	(12,760)	(21,430)	(24,025)
Net income available to common stockholders – Basic	$ 63,229	$ 66,147	$ 126,640	$ 123,980
Weighted average number of common shares outstanding – Basic	70,464	69,843	70,993	69,612
Net income per common share – Basic	$ 0.90	$ 0.95	$ 1.78	$ 1.78
NET INCOME PER SHARE—DILUTED:
Net income available to common stockholders – Diluted	$ 63,229	$ 66,147	$ 126,640	$ 123,980
Weighted average number of common shares outstanding – Basic	70,464	69,843	70,993	69,612
Weighted average number of common shares outstanding – Diluted	71,924	70,755	72,614	70,459
Net income per common share – Diluted	$ 0.88	$ 0.93	$ 1.74	$ 1.76
Potentially dilutive securities excluded as anti-dilutive	13,356	14,892	13,729	15,279
Exercise of Stock Options
NET INCOME PER SHARE—DILUTED:
Dilutive securities	914	716	928	662
Restricted Stock
NET INCOME PER SHARE—DILUTED:
Dilutive securities	323	0	442	0
Restricted Stock, Nonparticipating
NET INCOME PER SHARE—DILUTED:
Dilutive securities	223	196	251	185

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Net Income Per Share and Stockholders' Equity - Narrative (Details) - USD ($) $ in Thousands, shares in Millions		3 Months Ended			6 Months Ended
	Oct. 01, 2021	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Apr. 30, 2021
Net Income Per Share And Stockholders Equity [Line Items]
Share repurchases (in shares)			1.5		2.6
Share repurchases			$ (176,622)		$ (292,000)
Stock repurchase program, additional amount authorized					250,000
Stock repurchase program, authorized amount							$ 42,000
Allocation of ESOP shares to participants for compensation			10,085	$ 6,304	22,149	$ 10,340
Redeemable Convertible Preferred Stock
Net Income Per Share And Stockholders Equity [Line Items]
ESOP temporary equity stock distributed during period				(6,657)	(12,412)	(6,657)
Paid-In Capital
Net Income Per Share And Stockholders Equity [Line Items]
Allocation of ESOP shares to participants for compensation			$ 10,085	$ 6,304	$ 22,149	$ 10,340
Subsequent Event
Net Income Per Share And Stockholders Equity [Line Items]
Allocation of ESOP shares to participants for compensation (in shares)	1.1
Subsequent Event | Redeemable Convertible Preferred Stock | Scenario Forecast
Net Income Per Share And Stockholders Equity [Line Items]
ESOP temporary equity stock distributed during period		$ 17,600
Subsequent Event | Paid-In Capital | Scenario Forecast
Net Income Per Share And Stockholders Equity [Line Items]
Allocation of ESOP shares to participants for compensation		$ 17,600

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Related Party Transactions - Additional Information (Detail) - USD ($)	6 Months Ended
	Sep. 30, 2021	Mar. 31, 2021
Related Party Transaction [Line Items]
Outstanding principal balance including letters of credit	$ 5,500,000
South American Joint Venture
Related Party Transaction [Line Items]
Maximum borrowings permitted under credit facility	$ 22,000,000
Company's ownership percentage	50.00%
Percentage of debt guarantee	50.00%
Maximum potential payment under guarantee	$ 11,000,000
Outstanding principal balance including letters of credit	8,900,000	$ 10,000,000
South American Joint Venture | US Dollar Denominated Loans
Related Party Transaction [Line Items]
Outstanding principal balance including letters of credit	$ 0
South American Joint Venture | Chilean Peso Denominated Loans
Related Party Transaction [Line Items]
Weighted average interest rate	4.40%
Consolidated Entity Excluding Variable Interest Entities (VIE)
Related Party Transaction [Line Items]
Revolving credit facility maturity date	Jun. 22, 2018
Maximum borrowings permitted under credit facility	$ 12,000,000
Debt, expiration date	Jun. 22, 2022
Maximum borrowings permitted under credit facility	$ 0	$ 0
ADS Mexicana | Consolidated Entity Excluding Variable Interest Entities (VIE)
Related Party Transaction [Line Items]
Percentage of ownership in joint venture	49.00%
Consolidated Entity Excluding Variable Interest Entities (VIE) | ADS Mexicana
Related Party Transaction [Line Items]
Company's ownership percentage	51.00%

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Debt - Long-Term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Mar. 31, 2021
Debt Instrument [Line Items]
Long-term debt , Gross	$ 910,350	$ 791,250
Unamortized debt issuance costs	(1,839)	(2,030)
Current maturities	(7,000)	(7,000)
Long-term debt obligation	901,511	782,220
Term Loan Facility
Debt Instrument [Line Items]
Long-term debt , Gross	437,750	441,250
Senior Notes
Debt Instrument [Line Items]
Long-term debt , Gross	350,000	350,000
Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt , Gross	$ 122,600	$ 0

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Debt (Senior Secured Credit Facility) - Additional Information (Detail) - USD ($)	6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2021	Sep. 30, 2019
Debt Instrument [Line Items]
Repayment of borrowings	$ 24,200,000	$ 100,000,000
Proceeds from Revolving Credit Agreement	146,800,000	$ 0
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowings permitted under credit facility				$ 350,000,000
Repayment of borrowings	24,200,000
Outstanding letters of credit	12,500,000		$ 11,000,000
Proceeds from Revolving Credit Agreement	146,800,000
Letter of Credit Facility
Debt Instrument [Line Items]
Maximum borrowings permitted under credit facility				50,000,000
Sublimit of Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowings permitted under credit facility				50,000,000
Term Loan Facility
Debt Instrument [Line Items]
Aggregate principal amount				$ 700,000,000
Repayment of borrowings	$ 3,500,000

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Debt (Senior Notes) - Additional Information (Detail) - 5.0% Senior Notes due 2027 $ in Millions	Sep. 23, 2019 USD ($)
Debt Instrument [Line Items]
Aggregate principal amount	$ 350.0
Debt instrument, interest rate	5.00%

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Commitments and Contingencies (Purchase Commitments) - Additional Information (Detail) - Inventory	6 Months Ended
	Sep. 30, 2021 USD ($)
Purchase Commitment, Excluding Long-term Commitment [Line Items]
Purchase contracts period range, start	1 month
Purchase contracts period range, end	12 months
Total purchase commitment	$ 0

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Income Taxes - Additional Information (Detail)	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	26.10%	28.30%	25.80%	28.10%

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Stock-Based Compensation - Summary of Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	$ 5,618	$ 5,496	$ 12,269	$ 11,095
Non-Employee Director
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	465	332	816	649
Equity-Classified Stock Options
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	860	750	1,613	1,631
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	1,520	1,344	2,879	2,761
Performance Units
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	2,773	3,070	6,961	6,054
Cost of Goods Sold
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	685	565	1,319	966
Selling Expenses
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Additional stock-based compensation expense	$ 4,933	$ 4,931	$ 10,950	$ 10,129

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Stock-Based Compensation (2017 Omnibus Plan) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	May 24, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards	$ 0	$ (6)	$ (3,230)	$ (397)
2017 Omnibus Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock awards (in shares) (less than)	100,000		100,000
Restricted stock awards	$ 2,000		$ 7,300
2017 Omnibus Plan | Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of performance units granted, value			$ 5,300
2017 Omnibus Plan | Performance Shares | IWT
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of performance units granted			100,000
2017 Omnibus Plan | Exercise of Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options granted (in shares)			100,000
Number of stock options granted, value			$ 4,200
2017 Omnibus Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock approved for issuance					5,000,000

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Stock-Based Compensation - Summary of Assumption Used to Estimate Fair Value of Stock Options (Detail)	6 Months Ended
	Sep. 30, 2021 $ / shares
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Expected stock price volatility, minimum	41.00%
Risk-free interest rate	1.10%
Weighted-average expected option life (years)	6 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Common stock price	$ 105.82
Dividend yield	0.30%

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Business Segments Information - Additional Information (Detail)	6 Months Ended
	Sep. 30, 2021 segment
Segment Reporting [Abstract]
Number of reportable segments	3

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Business Segments Information - Schedule of Revenue from Reportable Segments by Product Type (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Net Sales	$ 706,471	$ 544,187	$ 1,375,771	$ 1,052,826
Operating Segments
Segment Reporting Information [Line Items]
Net Sales	(33,254)	(21,225)	(57,108)	(41,138)
Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(33,254)	(21,225)	(57,108)	(41,138)
Pipe
Segment Reporting Information [Line Items]
Net Sales	381,853	290,496	753,960	562,303
Pipe | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	384,521	292,133	758,531	565,785
Pipe | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(2,668)	(1,637)	(4,571)	(3,482)
Infiltrator
Segment Reporting Information [Line Items]
Net Sales	123,499	87,294	231,204	171,379
Infiltrator | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	145,911	105,986	272,653	208,139
Infiltrator | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(22,412)	(18,692)	(41,449)	(36,760)
International
Segment Reporting Information [Line Items]
Net Sales	58,404	48,402	120,856	84,231
International | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	63,574	49,298	128,940	85,127
International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(5,170)	(896)	(8,084)	(896)
International | International - Pipe
Segment Reporting Information [Line Items]
Net Sales	44,971	34,696	92,895	61,646
International | International - Pipe | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	50,141	35,592	100,979	62,542
International | International - Pipe | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	(5,170)	(896)	(8,084)	(896)
International | International - Allied Products & Other
Segment Reporting Information [Line Items]
Net Sales	13,433	13,706	27,961	22,585
International | International - Allied Products & Other | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	13,433	13,706	27,961	22,585
Allied Products & Other
Segment Reporting Information [Line Items]
Net Sales	142,715	117,995	269,751	234,913
Allied Products & Other | Operating Segments
Segment Reporting Information [Line Items]
Net Sales	145,719	117,995	272,755	234,913
Allied Products & Other | Intersegment Eliminations
Segment Reporting Information [Line Items]
Net Sales	$ (3,004)	$ 0	$ (3,004)	$ 0

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Business Segments Information - Schedule of Financial Information Attributable to Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Segment adjusted gross profit	$ 225,854	$ 228,935	$ 454,062	$ 438,980
Depreciation and amortization	34,194	35,778	68,850	71,559
Capital expenditures	38,218	18,664	63,764	28,959
Net sales	706,471	544,187	1,375,771	1,052,826
Pipe
Segment Reporting Information [Line Items]
Net sales	381,853	290,496	753,960	562,303
Infiltrator
Segment Reporting Information [Line Items]
Net sales	123,499	87,294	231,204	171,379
International
Segment Reporting Information [Line Items]
Net sales	58,404	48,402	120,856	84,231
Allied Products & Other
Segment Reporting Information [Line Items]
Net sales	142,715	117,995	269,751	234,913
Operating Segments
Segment Reporting Information [Line Items]
Net sales	(33,254)	(21,225)	(57,108)	(41,138)
Operating Segments | Pipe
Segment Reporting Information [Line Items]
Segment adjusted gross profit	82,472	100,496	166,615	191,095
Depreciation and amortization	12,026	11,543	24,061	22,903
Capital expenditures	12,809	3,911	22,639	8,142
Net sales	384,521	292,133	758,531	565,785
Operating Segments | Infiltrator
Segment Reporting Information [Line Items]
Segment adjusted gross profit	58,847	53,105	118,249	101,033
Depreciation and amortization	3,375	3,005	6,811	6,138
Capital expenditures	22,134	13,781	35,160	17,979
Net sales	145,911	105,986	272,653	208,139
Operating Segments | International
Segment Reporting Information [Line Items]
Segment adjusted gross profit	15,077	14,582	36,455	25,990
Depreciation and amortization	1,290	1,302	2,748	2,600
Capital expenditures	1,264	297	1,514	747
Net sales	63,574	49,298	128,940	85,127
Operating Segments | Allied Products & Other
Segment Reporting Information [Line Items]
Segment adjusted gross profit	67,979	60,380	131,278	120,848
Depreciation and amortization	17,503	19,928	35,230	39,918
Capital expenditures	2,011	675	4,451	2,091
Net sales	145,719	117,995	272,755	234,913
Intersegment Eliminations
Segment Reporting Information [Line Items]
Segment adjusted gross profit	1,479	372	1,465	14
Net sales	(33,254)	(21,225)	(57,108)	(41,138)
Intersegment Eliminations | Pipe
Segment Reporting Information [Line Items]
Net sales	(2,668)	(1,637)	(4,571)	(3,482)
Intersegment Eliminations | Infiltrator
Segment Reporting Information [Line Items]
Net sales	(22,412)	(18,692)	(41,449)	(36,760)
Intersegment Eliminations | International
Segment Reporting Information [Line Items]
Net sales	(5,170)	(896)	(8,084)	(896)
Intersegment Eliminations | Allied Products & Other
Segment Reporting Information [Line Items]
Net sales	$ (3,004)	$ 0	$ (3,004)	$ 0

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Business Segments Information - Reconciliation of Gross Profit to Segment Adjusted Gross Profit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	$ 200,057	$ 205,857	$ 401,178	$ 394,360
Depreciation and amortization	17,250	16,463	34,782	32,886
ESOP and stock-based compensation expense	8,547	6,598	18,102	11,537
COVID-19 related costs	0	17	0	197
Total Segment Adjusted Gross Profit	$ 225,854	$ 228,935	$ 454,062	$ 438,980

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Subsequent Events - Additional Information (Detail) - $ / shares	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 04, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared		$ 0.11	$ 0.09	$ 0.22	$ 0.18
Subsequent Event
Subsequent Event [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.11
Dividend payable date	Dec. 15, 2021
Dividend payable, date of record	Dec. 01, 2021