Document

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

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

For the Quarterly Period Ended June 30, 2017

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

Commission File No. 001-35253

WESCO AIRCRAFT HOLDINGS, INC.

(Exact Name of Registrant as Specified in Its Charter)



Delaware		20-5441563
(State of Incorporation)		(I.R.S. Employer Identification Number)

24911 Avenue Stanford

Valencia, CA 91355

(Address of Principal Executive Offices and Zip Code)

(661) 775-7200

(Registrant’s Telephone Number, Including Area Code)

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, and (2) has been subject to such filing requirements for the past 90 days. Yes x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files). Yes x No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See 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	x		Accelerated filer	o
Non-accelerated filer	o	(Do not check if a smaller reporting company)
			Smaller reporting company	o
			Emerging growth company	o

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. o

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

The number of shares of common stock (par value $0.001 per share) of the registrant outstanding as of August 1, 2017 was 99,579,363.

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INDEX



PART I		Page
FINANCIAL INFORMATION

Item 1.	Unaudited Consolidated Financial Statements:	3
	Consolidated Balance Sheets as of June 30, 2017 and September 30, 2016	3
	Consolidated Statements of Earnings and Comprehensive (Loss) Income for The Three and Nine Months ended June 30, 2017 and 2016	4
	Consolidated Statements of Cash Flows for The Nine Months ended June 30, 2017 and 2016	5
	Notes to the Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	18
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	30
Item 4.	Controls and Procedures	30

PART II
OTHER INFORMATION
Item 1.	Legal Proceedings	30
Item 1A.	Risk Factors	31
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	31
Item 3.	Defaults Upon Senior Securities	31
Item 4.	Mine Safety Disclosures	31
Item 5	Other Information	31
Item 6.	Exhibits	32
SIGNATURES		33

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PART I — FINANCIAL INFORMATION

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS.

Wesco Aircraft Holdings, Inc. and Subsidiaries

Consolidated Balance Sheets

(In thousands, except share data)

(Unaudited)



	June 30, 2017			September 30, 2016
Assets
Current assets
Cash and cash equivalents	$	57,056		$	77,061
Accounts receivable, net of allowance for doubtful accounts of $3,240 and $3,846 at June 30, 2017 and September 30, 2016, respectively	264,023			249,195
Inventories	802,709			713,470
Prepaid expenses and other current assets	12,865			10,203
Income taxes receivable	1,387			1,460
Total current assets	1,138,040			1,051,389
Property and equipment, net	51,172			50,525
Deferred line-of-credit financing costs, net	3,906			1,120
Goodwill	266,644			579,865
Intangible assets, net	182,045			194,114
Deferred tax assets	119,293			58,171
Other assets	12,566			13,394
Total assets	$	1,773,666		$	1,948,578

Liabilities and Stockholders’ Equity
Current liabilities
Accounts payable	$	175,834		$	181,700
Accrued expenses and other current liabilities	33,882			26,424
Income taxes payable	—			6,782
Capital lease obligations-current portion	2,922			1,471
Short-term borrowings and current portion of long-term debt	68,000			—
Total current liabilities	280,638			216,377
Capital lease obligations, less current portion	2,298			1,710
Long-term debt, less current portion	793,061			834,279
Deferred tax liabilities	4,092			4,092
Other liabilities	5,767			9,205
Total liabilities	1,085,856			1,065,663
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.001 par value per share: 50,000,000 shares authorized; no shares issued and outstanding	—			—
Common stock, $0.001 par value, 950,000,000 shares authorized, 99,579,363 and 98,614,908 shares issued and outstanding at June 30, 2017 and September 30, 2016, respectively	100			99
Additional paid-in capital	436,020			427,295
Accumulated other comprehensive loss	(84,283		)	(79,561		)
Retained earnings	335,973			535,082
Total stockholders’ equity	687,810			882,915
	$	1,773,666		$	1,948,578

See the accompanying notes to the consolidated financial statements

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Wesco Aircraft Holdings, Inc. and Subsidiaries

Consolidated Statements of Earnings and Comprehensive (Loss) Income

(In thousands, except share data)

(Unaudited)



	Three Months Ended June 30,						Nine Months Ended June 30,
	2017			2016			2017			2016
Net sales	$	363,907		$	375,186		$	1,067,877		$	1,111,771
Cost of sales	273,699			275,945			793,457			813,564
Gross profit	90,208			99,241			274,420			298,207
Selling, general and administrative expenses	66,313			59,197			192,071			179,708
Goodwill impairment	311,114			—			311,114			—
(Loss) income from operations	(287,219		)	40,044			(228,765		)	118,499
Interest expense, net	(9,614		)	(9,325		)	(29,529		)	(27,436		)
Other income, net	256			2,657			289			3,960
(Loss) income before provision for income taxes	(296,577		)	33,376			(258,005		)	95,023
Benefit (provision) for income taxes	66,969			(9,360		)	58,946			(26,906		)
Net (loss) income	(229,608		)	24,016			(199,059		)	68,117
Other comprehensive income (loss), net	960			(21,936		)	(4,722		)	(36,128		)
Comprehensive (loss) income	$	(228,648	)	$	2,080		$	(203,781	)	$	31,989
Net (loss) income per share:
Basic	$	(2.32	)	$	0.25		$	(2.02	)	$	0.70
Diluted	$	(2.32	)	$	0.24		$	(2.02	)	$	0.69
Weighted average shares outstanding:
Basic	98,869,675			97,929,438			98,558,330			97,511,590
Diluted	98,869,675			98,599,215			98,558,330			98,108,904

See the accompanying notes to the consolidated financial statements

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Wesco Aircraft Holdings, Inc. and Subsidiaries

Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)



	Nine Months Ended June 30,
	2017			2016
Cash flows from operating activities
Net (loss) income	$	(199,059	)	$	68,117
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,812			20,843
Amortization of deferred financing costs	5,136			3,144
Bad debt and sales return reserve	(252		)	41
Goodwill impairment	311,114			—
Stock-based compensation expense	5,958			6,406
Excess tax benefit related to stock-based incentive plans	—			(796		)
Deferred income taxes	(62,231		)	4,240
Other non-cash items	528			(4,374		)
Changes in assets and liabilities:
Accounts receivable	(15,972		)	(10,466		)
Inventories	(91,599		)	(25,253		)
Prepaid expenses and other assets	(1,854		)	(352		)
Income taxes receivable	86			5
Accounts payable	(5,675		)	21,466
Accrued expenses and other liabilities	6,905			(6,098		)
Income taxes payable	(6,743		)	(10,330		)
Net cash (used in) provided by operating activities	(32,846		)	66,593

Cash flows from investing activities
Purchase of property and equipment	(6,831		)	(11,161		)
Proceeds from sales of assets	—			2,000
Net cash used in investing activities	(6,831		)	(9,161		)

Cash flows from financing activities
Proceeds from short-term borrowings	60,000			—
Repayment of short-term borrowings	(12,000		)	—
Repayment of long-term debt	(16,344		)	(76,000		)
Financing costs	(12,796		)	(2,126		)
Repayment of capital lease obligations	(1,278		)	(1,037		)
Excess tax benefit related to stock-based incentive plans	—			796
Proceeds from issuance of common stock	2,965			6,126
Settlement on restricted stock tax withholding	(264		)	—
Net cash provided by (used in) financing activities	20,283			(72,241		)
Effect of foreign currency exchange rate on cash and cash equivalents	(611		)	(2,572		)
Net decrease in cash and cash equivalents	(20,005		)	(17,381		)
Cash and cash equivalents, beginning of period	77,061			82,866
Cash and cash equivalents, end of period	$	57,056		$	65,485

See the accompanying notes to the consolidated financial statements

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Wesco Aircraft Holdings, Inc. & Subsidiaries

Notes to the Consolidated Financial Statements

(Unaudited)

Note 1. Basis of Presentation and Significant Accounting Policies

The accompanying unaudited consolidated financial statements include the accounts of Wesco Aircraft Holdings, Inc. and its wholly owned subsidiaries (referred to herein as “Wesco” or the “Company”) prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and with the instructions to Form 10-Q and Article 10 of Regulation S-X. The financial statements presented herein have not been audited by an independent registered public accounting firm, but include all material adjustments (consisting of normal recurring adjustments) which are, in the opinion of management, necessary for fair statement of the financial position, results of operations and cash flows for the period. However, these results are not necessarily indicative of results for any other interim period or for the full fiscal year. The preparation of financial statements in conformity with GAAP requires us to make certain estimates and assumptions for the reporting periods covered by the financial statements. These estimates and assumptions affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent liabilities. Actual amounts could differ from these estimates.

Certain information and footnote disclosures normally included in financial statements in accordance with GAAP have been omitted pursuant to the rules of the Securities and Exchange Commission (“SEC”). The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K filed with the SEC on November 28, 2016, as amended by Amendment No. 1 to Annual Report on Form 10-K/A filed with the SEC on December 14, 2016 (collectively, the “2016 Form 10-K”).

Certain reclassifications have been made to the amounts in prior periods in order to conform to the current period’s presentation.

Deferred Financing Costs

Debt issuance costs incurred in connection with the issuance of our long-term debt are capitalized and amortized to interest expense over the term of the debt using the straight-line method, which approximates the effective interest method. The unamortized amount is presented as a reduction of long-term debt on the balance sheet.

Debt issuance costs incurred in connection with our revolving line-of-credit (LOC) agreement are capitalized and amortized to interest expense over the term of the LOC agreement using the straight-line method. The unamortized amount is presented as a non-current asset on the balance sheet.

Note 2. Recent Accounting Pronouncements

Changes to GAAP are established by the Financial Accounting Standards Board (“FASB”) in the form of Accounting Standards Updates (“ASUs”) to the FASB’s Accounting Standards Codification (“ASC”).

We consider the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position and results of operations.

New Accounting Standards Issued

In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment, which simplifies the current requirements for testing goodwill for impairment by eliminating the second step of the two-step impairment test to measure the amount of an impairment loss. ASU 2017-04 is effective for the Company in fiscal year 2021, including interim reporting periods within that reporting period, and all annual and interim reporting periods thereafter. Early adoption is permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements.

In March 2016, the FASB issued ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323), Simplifying the Transition to the Equity Method of Accounting. ASU 2016-07 eliminates the requirement that when an investment subsequently qualifies for use of the equity method as a result of an increase in level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. ASU 2016-07 requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of

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the investor’s previously held interest and to adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. In addition, ASU 2016-07 requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. ASU 2016-07 is effective for the Company in fiscal year 2018, with early adoption permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements.

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from current GAAP. ASU 2016-02 retains a distinction between finance leases (i.e. capital leases under current GAAP) and operating leases. The classification criteria for distinguishing between finance leases and operating leases will be substantially similar to the classification criteria for distinguishing between capital leases and operating leases under current GAAP. ASU 2016-02 also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. A modified retrospective transition approach shall be used when adopting ASU 2016-02, which includes a number of optional practical expedients that entities may elect to apply. ASU 2016-02 is effective for the Company in fiscal year 2020 and interim periods therein, with early application permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements. As of September 30, 2016, total future minimum payments under our operating leases amounted to $57.8 million.

In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which affects the accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements of financial instruments. ASU 2016-01 is effective for the Company in fiscal year 2019, with early adoption permitted for certain provisions. We are currently evaluating the impact of ASU 2016-01 related to equity investments and the presentation and disclosure requirements of financial instruments on our consolidated financial statements.

In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory, which requires an entity to measure inventory at the lower of cost and net realizable value, and eliminates current GAAP options for measuring market value. ASU 2015-11 defines realizable value as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. ASU 2015-11 is effective for the Company in fiscal year 2018, and interim periods therein. Early adoption is permitted for financial statements that have not been previously issued. ASU 2015-11 can only be applied prospectively. We do not anticipate the adoption of ASU 2015-11 will have a significant impact on our consolidated financial statements.

In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which amends ASC Subtopic 205-40 to provide guidance about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related disclosures. Specifically, ASU 2014-15 (1) provides a definition of the term “substantial doubt,” (2) requires an evaluation every reporting period, (3) provides principles for considering the mitigating effect of management’s plans, (4) requires certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) requires an express statement and other disclosures when substantial doubt is not alleviated, and (6) requires an assessment for a period of one year after the date that financial statements are issued. ASU 2014-15 is effective for the Company in fiscal year 2017, and for annual periods and interim periods thereafter. We do not anticipate the adoption of ASU 2014-15 will have a significant impact on our consolidated financial statements.

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is amended by ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-11, ASU 2016-12, ASU 2016-20 and ASU 2017-10, which FASB issued in August 2015, March 2016, April 2016, May 2016, May 2016, December 2016 and May 2017, respectively (collectively the “amended ASU 2014-09”). The amended ASU 2014-09 provides a single comprehensive model for the recognition of revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. It requires an entity to recognize revenue when the entity transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amended ASU 2014-09 creates a five-step model that requires entities to exercise judgment when considering the terms of contract(s), which includes (1) identifying the contract(s) with the customer, (2) identifying the separate performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the separate performance obligations, and (5) recognizing revenue as each performance obligation is satisfied. The amended ASU 2014-09 requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including qualitative and quantitative information about contracts with customers, significant judgments

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and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The effective date for the amended ASU 2014-09 for the Company is fiscal year 2019, including interim reporting periods within that reporting period. Early adoption is permitted for fiscal year 2018, including interim reporting periods within that reporting period.

The amended ASU 2014-09 may have an impact on the timing and amount of revenues and cost of sales in our industry due primarily to changes in whether certain performance obligations are accounted for on a gross or net basis, separating service revenue from the related product revenue, reporting costs currently included in operating expense as costs of services, and capitalizing certain up-front costs related to contracts and amortizing them over the service period. We have begun reviewing our largest contracts to determine the extent to which these and other issues may impact on our results after adoption. We plan to adopt the amended ASU 2014-09 in fiscal 2019 using the modified retrospective method.

Adopted Accounting Standards

Effective October 1, 2016, we elected to early adopt ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The primary impacts of adoption are (1) the recognition of excess tax benefits in our benefit (provision) for income taxes instead of paid-in capital and (2) the presentation of excess tax benefits in the statement of cash flows as cash provided by operating activities instead of cash provided by financing activities. The first requirement is required to be applied prospectively. For the nine months ended June 30, 2017, we recorded $1.2 million of excess tax benefits as a reduction to our provision for income tax. For the second requirement, we elected to adopt this update prospectively. For the nine months ended June 30, 2017, we included the $1.2 million excess tax benefits in cash provided by operating activities on our consolidated statements of cash flows.

ASU 2016-09 also addresses cash flow statement presentation. Since we have historically presented cash flows related to employee taxes paid for withheld shares as a financing activity, ASU 2016-09 had no impact on our consolidated statements of cash flows. As permitted by ASU 2019-09, we have elected to continue to estimate forfeitures to determine the amount of compensation cost to be recognized in each period.

Effective October 1, 2016, we adopted, on a prospective basis, ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments, which requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. As of June 30, 2017, we did not have any provisional amounts outstanding from prior acquisitions. Therefore, the adoption of ASU 2015-16 did not have any impact on our consolidated financial statements.

Effective October 1, 2016, we adopted ASU 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements. ASU 2015-15 states entities should present debt issuance costs as an asset, and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. As of June 30, 2017 and September 30, 2016, we had $3.9 million and $1.1 million, respectively, of deferred financing costs related to our revolving line-of-credit facility.

Effective October 1, 2016, we adopted ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Cost. ASU 2015-03 requires that we change the presentation of debt issuance costs on our consolidated balance sheets. Effective October 1, 2016, our unamortized debt financing costs are presented as a reduction of long-term debt instead of being presented as an asset on our consolidated balance sheet. As required by ASU 2015-03, we reclassified $7.6 million of deferred debt financing costs from non-current assets to reduce our $841.9 million long-term debt as of September 30, 2016. As of June 30, 2017, deferred debt financing costs of $12.5 million are presented as a reduction of our long-term debt. See Note 6 for further information.

Effective October 1, 2016, we adopted, on a prospective basis, ASU 2014-12, Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments when the Terms of an Award Provide that a Performance Target Could Be Achieved After the Requisite Service Period. ASU 2014-12 requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The adoption of ASU 2014-12 did not have any impact on our consolidated financial statements.

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Note 3. Inventory

Our inventory is comprised solely of finished goods. During the three months ended June 30, 2017 and 2016, we recorded a charge to cost of sales of $3.8 million and $3.2 million, respectively, to write down excess inventory to its net realizable value. During the nine months ended June 30, 2017 and 2016, we recorded a charge to cost of sales of $9.1 million and $9.6 million, respectively, to write down excess inventory to its net realizable value.

Note 4. Goodwill

During the nine months ended June 30, 2017, goodwill declined $313.2 million, of which $311.1 million was an impairment charge and $2.1 million was a reduction as a result of the strengthening of the U.S. dollar compared to the British pound.

Goodwill consists of the following (in thousands):



	North America			Rest of World			Total
Goodwill as of September 30, 2016, gross	$	779,647		$	63,989		$	843,636
Accumulated impairment	(263,771		)	—			(263,771		)
Goodwill as of September 30, 2016, net	515,876			63,989			579,865
Changes during the period:
Foreign currency translation	—			(2,107		)	(2,107		)
Goodwill impairment	(311,114		)	—			(311,114		)

Goodwill as of June 30, 2017, gross	779,647			61,882			841,529
Accumulated impairment	(574,885		)	—			(574,885		)
Goodwill as of June 30, 2017, net	$	204,762		$	61,882		$	266,644

We test goodwill for impairment using a qualitative assessment process or a two-step quantitative assessment process. Step 1 of the quantitative process involves comparing the carrying value of net assets, including goodwill, to the fair value of the reporting unit. If the fair value exceeds its carrying amount, goodwill is not considered impaired and the second step of the process is unnecessary. If the carrying amount of a reporting unit’s goodwill exceeds its fair value, the second step measures the impairment loss, if any.

We have four reporting units, which are North America Hardware, Rest of World Hardware, North America Chemical and Rest of World Chemical. The estimates of fair value of a reporting unit are determined based on a discounted cash flow analysis and market earnings multiples. A discounted cash flow analysis requires us to make various judgmental assumptions, including assumptions about future cash flows, growth rates and discount rates. The assumptions about future cash flows and growth rates are based on the forecast and long-term business plans of each reporting unit. Discount rate assumptions are based on an assessment of the risk inherent in the future cash flows of the respective reporting units.

The preparation of our internal forecasts requires significant judgments, including the estimation of the long-term rate of growth for our business, estimation of the useful life over which cash flows will occur, cost expectations, changes in working capital, growth rates, discount rates, and other factors. Changes in these factors could significantly change our internal forecasts, which could significantly change the amount of impairment recorded, if any.

We performed a Step 1 goodwill impairment test on July 1, 2016 on all four reporting units, which indicated no impairment. For the North America Hardware and North America Chemical reporting units, the fair value was in excess of carrying value by 29% and 15%, respectively. Since 2016, North America Hardware and North America Chemical reporting units have underperformed relative to the forecasts included in the Step 1 analysis; however, our qualitative impairment assessments performed on December 31, 2016 and March 31, 2017 did not indicate it was more likely than not that the carrying value exceeded the fair value of the two reporting units. During the third quarter of fiscal 2017, our stock price experienced a sustained decline in value. Additionally, during June 2017, we reassessed our five year outlook following the appointment of our new CEO in May 2017. The cash flows in this updated five year forecast indicated that it was more likely than not that the goodwill in the North America Hardware and North America Chemical reporting units was impaired. These events triggered our decision to perform a quantitative goodwill impairment test as of June 30, 2017.

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We performed our Step 1 goodwill impairment test on June 30, 2017 on all four reporting units. The results of these tests indicated that the North America Hardware and North America Chemical reporting units were impaired. Lower projected revenue growth and operating results reflected changes in assumptions related to organic growth rates, market trends, business mix, cost structure and other expectations about the anticipated short-term and long-term operating results of these two reporting units, resulting in lower estimated fair values. As a result, we proceeded to Step 2 of the goodwill impairment analysis using the most appropriate valuation methods and compared the implied value of goodwill with the carrying value of the goodwill for each of the impaired reporting units.

Step 2 compares the implied fair value of goodwill with the carrying amount of that goodwill. The implied fair value of goodwill is determined in the same manner as the amount of goodwill recognized in a business combination. The implied fair value of the reporting unit’s goodwill is calculated by creating a hypothetical balance sheet as if the reporting unit had just been acquired. This balance sheet contains all assets and liabilities recorded at fair value (including any intangible assets that may not have any corresponding carrying value in our balance sheet). The implied value of the reporting unit’s goodwill is calculated by subtracting the fair value of the net assets from the fair value of the reporting unit. If the carrying value of goodwill exceeds the implied fair value of that goodwill, an impairment loss is recognized in an amount equal to that excess.

In applying the Step 2 analysis to the North America Hardware and North America Chemical reporting units, we determined that the fair value of certain identifiable intangibles including trademarks, customer relationships, and technology exceeded their carrying values by a significant amount which further reduced the implied fair value of goodwill. We recorded a non-cash impairment charge of $240.6 million for North America Hardware and $70.5 million for North America Chemical, for a total impairment charge of $311.1 million in the three months ended June 30, 2017 to reduce each reporting unit’s carrying value goodwill to its implied fair value. The remaining goodwill for the North America Hardware and North America Chemical reporting units was $51.4 million and $153.4 million, respectively, as of June 30, 2017, and after recording the impairment charges, the fair values of these reporting units exceeded their carrying values by 8% and 9%, respectively. The Rest of World Hardware and Rest of World Chemical reporting units were not impaired with estimated fair values of these reporting units exceeding their carrying values by 105% and 22%, respectively.

Note 5. Fair Value of Financial Instruments

Derivative Financial Instruments

We use derivative instruments primarily to manage exposures to foreign currency exchange rates and interest rates. Our primary objective in holding derivatives is to reduce the volatility of earnings and cash flows associated with fluctuations in foreign exchange rates and changes in interest rates. Our derivatives expose us to credit risk to the extent that the counter-parties may be unable to meet the terms of the agreement. We, however, seek to mitigate such risks by limiting our counter-parties to major financial institutions. In addition, the potential risk of loss with any one counter-party resulting from this type of credit risk is monitored. Management does not expect material losses as a result of defaults by counter-parties.

Cash Flow Hedges of Interest Rate Risk

Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements. To accomplish these objectives, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable amounts from a counterparty in exchange for our making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. In July 2015, we entered into two interest rate swap agreements, which we designated as cash flow hedges, in order to reduce our exposure to variability in cash flows related to interest payments on a portion of our outstanding debt. The first interest rate swap agreement has an amortizing notional amount, which was $387.5 million as of June 30, 2017, and matures on September 30, 2017, giving us the contractual right to pay a fixed interest rate of 1.21% plus the applicable margin under the term loan B facility (as defined in Note 6 below; see Note 6 for the applicable margin). The second interest rate swap agreement also has an amortizing notional amount, initially $375.0 million, giving us the contractual right to pay a fixed interest rate of 2.2625% plus the applicable margin under the term loan B facility, which is effective on September 29, 2017 and matures on September 30, 2019.

The effective portion of changes in the fair value of derivatives designated and that qualify as cash flow hedges is recorded in accumulated other comprehensive income (loss) (“AOCI”) and is subsequently reclassified into earnings in the period that the hedged forecasted transaction affects earnings. During the nine months ended June 30, 2017, such derivatives were used to hedge the variable cash flows associated with existing variable-rate debt. The ineffective portion of the change in

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fair value of the derivatives is recognized immediately in earnings. During the nine months ended June 30, 2017, we did not record any hedge ineffectiveness in earnings. No portion of our interest rate swap agreements is excluded from the assessment of hedge effectiveness.

Amounts reported in AOCI related to derivatives and the related deferred tax are reclassified to interest expense as interest payments are made on our variable-rate debt. As of June 30, 2017, we expected to reclassify approximately $2.1 million from accumulated other comprehensive loss and the related deferred tax to earnings as an increase to interest expense over the next 12 months.

Non-Designated Derivatives

On October 3 and October 5, 2016, we entered into two foreign currency forward contracts to partially reduce our exposure to foreign currency fluctuations for a subsidiary's net monetary assets, which are denominated in a foreign currency. Both foreign currency forward contracts expired on December 28, 2016. On January 6, 2017, we entered into one foreign currency forward contract to partially reduce our exposure to foreign currency fluctuations for a subsidiary's net monetary assets, which are denominated in a foreign currency. The foreign currency forward contract expired on March 30, 2017. The derivatives were not designated as a hedging instrument. The change in their fair value is recognized as periodic gain or loss in the other income (loss), net line of our consolidated statement of earnings and comprehensive income. We did not have foreign currency forward contracts as of June 30, 2017 and September 30, 2016.

The following table summarizes the notional principal amounts at June 30, 2017, and September 30, 2016 of our outstanding derivative instruments discussed above (in thousands).



	Derivative Notional
	June 30, 2017		September 30, 2016
Instruments designated as accounting hedges:
Interest rate contracts	$	387,500	$	425,000

The following table provides the location and fair value amounts of our financial instruments, which are reported in our consolidated balance sheets as of June 30, 2017 and September 30, 2016 (in thousands).



		Fair Value
	Balance Sheet Locations	June 30, 2017		September 30, 2016
Instruments designated as accounting hedges:

Interest rate contracts	Other current assets	$	83	$	—
Interest rate contracts	Accrued expenses and other current liabilities	2,069		1,057
Interest rate contracts	Other liabilities	1,482		5,615

The following table provides the losses of our cash flow hedging instruments (net of income tax benefit), which were transferred from AOCI to interest expense on our consolidated statement of comprehensive income during the three and nine months ended June 30, 2017 and 2016 (in thousands).



	Location in Consolidated Statement of Comprehensive Income	Three Months Ended June 30,				Nine Months Ended June 30,
		Three Months Ended June 30,				Nine Months Ended June 30,
Cash Flow Hedge		2017		2016		2017		2016
Interest rate contracts	Interest expense, net	$	39	$	330	$	428	$	1,020

The following table provides the effective portion of the amount of (loss) gain recognized in other comprehensive income (net of income taxes) for the three and nine months ended June 30, 2017 and 2016 (in thousands).

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	Three Months Ended June 30,						Nine Months Ended June 30,
	Three Months Ended June 30,						Nine Months Ended June 30,
Cash Flow Hedge	2017			2016			2017		2016
Interest rate contracts	$	(474	)	$	(873	)	$	1,976	$	(2,387	)

The following table provides a summary of changes to our AOCI related to our cash flow hedging instruments (net of income taxes) during the three and nine months ended June 30, 2017 (in thousands).



AOCI - Unrealized Gain (Loss) on Hedging Instruments	Three Months Ended June 30, 2017			Nine Months Ended June 30, 2017
Balance at beginning of period	$	(1,756	)	$	(4,206	)
Change in fair value of hedging instruments	(513		)	1,548
Amounts reclassified to earnings	39			428
Net current period other comprehensive income	(474		)	1,976
Balance at end of period	$	(2,230	)	$	(2,230	)

The following table provides the pretax effect of our derivative instruments not designated as hedging instruments on our consolidated statements of earnings and comprehensive income for the three and nine months ended June 30, 2017 and 2016 (in thousands).



	Location in Consolidated Statement of Comprehensive Income	Three Months Ended June 30,					Nine Months Ended June 30,
Instruments Not Designated As Hedging Instruments		Three Months Ended June 30,					Nine Months Ended June 30,
Instruments Not Designated As Hedging Instruments		2017		2016			2017			2016
Foreign currency forward contracts	Other income (loss), net	$	—	$	(523	)	$	(1,843	)	$	(2,161	)

Other Financial Instruments

Our financial instruments consist of cash and cash equivalents, accounts receivable and payable, accrued expenses and other current liabilities, and a line of credit. The carrying amounts of these instruments approximate fair value because of their short-term duration. The fair value of the long-term debt instruments is determined using current applicable rates for similar instruments as of the balance sheet date, a Level 2 measurement (as defined below). The principal amounts and fair values of the debt instruments were as follows (in thousands):



	June 30, 2017				September 30, 2016
	Principal Amount		Fair Value		Principal Amount		Fair Value
Term loan A facility	$	385,000	$	381,728	$	401,344	$	401,344
Term loan B facility	440,562		427,823		440,562		435,716
Total long-term debt	$	825,562	$	809,551	$	841,906	$	837,060

Fair Value Measurement

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. To determine fair value, we primarily utilize reported market transactions and discounted cash flow analysis. We use a three tier fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs. The fair value hierarchy prioritizes the inputs to valuation techniques into three broad levels whereby the highest priority is given to Level 1 inputs and the lowest to Level 3 inputs. The three broad categories are:

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Level 1:	Quoted prices in active markets for identical assets or liabilities.
Level 2:	Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly.
Level 3:	Unobservable inputs for the asset or liability.

The definition of fair value includes the consideration of nonperformance risk. Nonperformance risk refers to the risk that an obligation (either by a counter party or us) will not be fulfilled. For financial assets traded in an active market (Level 1), the nonperformance risk is included in the market price. For certain other financial assets and liabilities (Level 2 and 3), our fair value calculations have been adjusted accordingly.

There were no transfers between the assets and liabilities under Level 1 and Level 2 during the nine months ended June 30, 2017. The following tables provide the valuation hierarchy classification of assets and liabilities that are carried at fair value and measured on a recurring basis in our consolidated balance sheets as of June 30, 2017 and September 30, 2016 (in thousands).



June 30, 2017	Balance Sheet Locations	Total		Level 1		Level 2		Level 3

Instruments designated as accounting hedges:

Interest rate contracts	Other current assets	$	83	$	—	$	83	$	—
Interest rate contracts	Accrued expenses and other current liabilities	2,069		—		2,069		—
Interest rate contracts	Other liabilities	1,482		—		1,482		—



September 30, 2016	Balance Sheet Locations	Total		Level 1		Level 2		Level 3

Instruments designated as accounting hedges:

Interest rate contracts	Accrued expenses and other current liabilities	$	1,057	$	—	$	1,057	$	—
Interest rate contracts	Other liabilities	5,615		—		5,615		—

We use observable market-based inputs to calculate fair value of our interest rate swap agreements and outstanding debt instruments, in which case the measurements are classified within Level 2. If quoted or observable market prices are not available, fair value is based upon internally developed models that use, where possible, current market‑based parameters such as interest rates, yield curves and currency rates. These measurements are classified within Level 3.

Note 6. Long-Term Debt

The credit agreement, dated as of December 7, 2012 (as amended), by and among the Company, Wesco Aircraft Hardware (the “Borrower”) and the lenders and agents party thereto, which governs our senior secured credit facilities, provides for (1) a $400.0 million senior secured term loan A facility (the “term loan A facility”), (2) a $180.0 million revolving facility (the “revolving facility”), and (3) a $525.0 million senior secured term loan B facility (the “term loan B facility”). We refer to term loan A facility, the revolving facility and the term loan B facility, together, as the “Credit Facilities.”

On March 28, 2017, we entered into the Fifth Amendment (the “Fifth Amendment”) to our credit agreement (as amended prior to the Fifth Amendment, the “Credit Agreement”; the Credit Agreement, as amended by the Fifth Amendment, the “Amended Credit Agreement”).

The Fifth Amendment modified the Credit Agreement to reduce the maximum amount permitted to be incurred under a Capped Incremental Facility (as such term is defined in the Amended Credit Agreement) from $150.0 million to $75.0 million, unless the Consolidated Total Leverage Ratio (as such term is defined in the Amended Credit Agreement), after giving effect to the incurrence of any incremental loans or commitments and the use of proceeds thereof, on a pro forma basis, would be less than or equal to 3.50, in which case the Capped Incremental Facility will remain at $150.0 million.

The Fifth Amendment also modified the Credit Agreement to (a) increase the highest possible interest rate margin applicable to loans under the term loan A facility and loans and commitments under the revolving facility from 2.75% to 3.00%

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for Eurocurrency loans and from 1.75% to 2.00% for Alternate Base Rate (“ABR”) loans and (b) increase the Consolidated Total Leverage Ratio levels in the financial covenant set forth in the Credit Agreement to a maximum of 4.50 for the quarters ending June 30, 2017 and September 30, 2017, with step-downs to 4.25 for the quarters ending December 31, 2017 and March 31, 2018; 4.00 for the quarters ending June 30, 2018 and September 30, 2018; 3.75 for the quarters ending December 31, 2018 and March 31, 2019; and 3.50 for the quarter ending June 30, 2019 and thereafter.

Long-term debt consists of the following (in thousands):



	June 30, 2017									September 30, 2016
	Principal Amount			Deferred Financing Costs			Carrying Amount			Principal Amount		Deferred Financing Costs			Carrying Amount
Term loan A facility	$	385,000		$	(8,035	)	$	376,965		$	401,344	$	(2,247	)	$	399,097
Term loan B facility	440,562			(4,466		)	436,096			440,562		(5,380		)	435,182
Less: current portion	(20,000		)	—			(20,000		)	—		—			—
Non-current portion	$	805,562		$	(12,501	)	$	793,061		$	841,906	$	(7,627	)	$	834,279

During the nine months ended June 30, 2017, we made three required quarterly payments totaling $15.0 million and a voluntary prepayment of $1.3 million on our term loan A facility and two voluntary prepayments totaling $12.0 million on our borrowings under the revolving facility. As of June 30, 2017, $48.0 million of indebtedness was outstanding and $132.0 million was available for borrowing under the revolving facility, of which we could use up to $39.3 million to fund our operating and investing activities without breaching any covenants contained in the Amended Credit Agreement.

The interest rate for the term loan A facility is based on our Consolidated Total Leverage Ratio as determined in the most recently delivered financial statements, with the respective margins ranging from 2.00% to 3.00% for Eurocurrency loans and 1.00% to 2.00% for ABR loans. The term loan A facility amortizes in equal quarterly installments of 1.25% of the original principal amount of $400.0 million with the balance due on the earlier of (i) 90 days before the maturity of the term loan B facility, and (ii) October 4, 2021. As of June 30, 2017, the interest rate for borrowings under the term loan A facility was 4.23%, which approximated the effective interest rate.

The interest rate for the term loan B facility has a margin of 2.50% per annum for Eurocurrency loans (subject to a minimum Eurocurrency rate floor of 0.75% per annum) or 1.50% per annum for ABR loans (subject to a minimum ABR floor of 1.75% per annum). The term loan B facility amortizes in equal quarterly installments of 0.25% of the original principal amount of $525.0 million, with the balance due at maturity on February 28, 2021. As of June 30, 2017, the interest rate for borrowings under the term loan B facility was 3.8%, which approximated the effective interest rate. In July 2015, we entered into interest rate swap agreements relating to this indebtedness, which are described in greater detail in Note 5 above.

The interest rate for the revolving facility is based on our Consolidated Total Leverage Ratio as determined in the most recently delivered financial statements, with the respective margins ranging from 2.00% to 3.00% for Eurocurrency loans and 1.00% to 2.00% for ABR loans. The revolving facility expires on the earlier of (i) 90 days before the maturity of the term loan B facility, and (ii) October 4, 2021. As of June 30, 2017, the weighted-average interest rate for borrowings under the revolving facility was 4.13%.

As a result of the Fourth Amendment to our Credit Agreement on October 4, 2016, we incurred $10.5 million in fees that were capitalized, $7.2 million of which was related to the term loan A facility and $3.3 million of which was related to the revolving facility. Of the $3.4 million of the unamortized deferred financing costs related to the Credit Agreement prior to the Fourth Amendment, $2.3 million was written off as debt extinguishment loss in the nine months ended June 30, 2017, which was included in interest expense for the period. As a result of the Fifth Amendment to our Credit Agreement on March 28, 2017, we incurred $2.3 million in fees that were capitalized, $1.6 million of which was related to the term loan A facility and $0.7 million of which was related to the revolving facility. The deferred financing costs of term loan B were not impacted by the Fourth Amendment or Fifth Amendment. The following table summarizes the total deferred financing costs for the term loan A facility, the term loan B facility and the revolving facility, which will be amortized over their remaining terms.

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	Term Loan A Facility			Term Loan B Facility			Revolving Facility			Total
Deferred financing costs as of September 30, 2016	$	2,247		$	5,378		$	1,120		$	8,745
Write off for the Fourth Amendment	(1,769		)	—			(553		)	(2,322		)
Deferred financing costs for the Fourth Amendment	7,215			—			3,247			10,462
Deferred financing costs for the Fifth Amendment	1,617			—			719			2,336
Amortization of deferred financing costs	(1,275		)	(912		)	(627		)	(2,814		)
Deferred financing costs as of June 30, 2017	$	8,035		$	4,466		$	3,906		$	16,407

Our borrowings under the Credit Facilities are guaranteed by us and all of our direct and indirect, wholly-owned, domestic restricted subsidiaries (subject to certain exceptions) and secured by a first lien on substantially all of our assets and the assets of our guarantor subsidiaries, including capital stock of the subsidiaries (in each case, subject to certain exceptions).

Our borrowings under the Credit Facilities are subject to a financial covenant based upon our Consolidated Total Leverage Ratio with the maximum ratio set at 4.50 for the three months ended June 30, 2017. The Amended Credit Agreement also contains customary negative covenants, including restrictions on our and our restricted subsidiaries’ ability to merge and consolidate with other companies, incur indebtedness, grant liens or security interests on assets, make acquisitions, loans, advances or investments, pay dividends, sell or otherwise transfer assets, optionally prepay or modify terms of any junior indebtedness or enter into transactions with affiliates. We were in compliance with all of the foregoing covenants, and our Consolidated Total Leverage Ratio was 4.29 as of June 30, 2017.

As of June 30, 2017, our subsidiary, Wesco Aircraft Europe, Ltd, has available a £7.0 million ($9.1 million based on the June 30, 2017 exchange rate) line of credit that automatically renews annually on October 1 (the “UK line of credit”). The UK line of credit bears interest based on the base rate plus an applicable margin of 1.65%. As of June 30, 2017, the full £7.0 million was available for borrowing under the UK line of credit without breaching any covenants contained in the agreements governing our indebtedness, provided such borrowing, combined with borrowings under the Credit Facilities, does not cause us to exceed the maximum Consolidated Total Leverage Ratio.

Note 7. Comprehensive (Loss) Income

Comprehensive (loss) income, which is net of income taxes, consists of the following (in thousands):



	Three Months Ended June 30,						Nine Months Ended June 30,
	2017			2016			2017			2016
Net (loss) income	$	(229,608	)	$	24,016		$	(199,059	)	$	68,117
Foreign currency translation gain (loss)	1,434			(21,063		)	(6,698		)	(33,741		)
Unrealized (loss) gain on cash flow hedging instruments	(474		)	(873		)	1,976			(2,387		)
Total comprehensive (loss) income	$	(228,648	)	$	2,080		$	(203,781	)	$	31,989

Note 8. Net (Loss) Income Per Share

Basic net (loss) income per share is computed by dividing net (loss) income available to common stockholders by the weighted average number of common shares outstanding during the period. Diluted net (loss) income per share includes the dilutive effect of both outstanding stock options and restricted shares, calculated using the treasury stock method. Assumed proceeds from in-the-money awards are calculated under the “as-if” method as prescribed by ASC 718, Compensation—Stock Compensation. The following table provides our basic and diluted net (loss) income per share for the three and nine months ended June 30, 2017 and 2016 (dollars in thousands except share data):

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	Three Months Ended June 30,					Nine Months Ended June 30,
	2017			2016		2017			2016
Net (loss) income	$	(229,608	)	$	24,016	$	(199,059	)	$	68,117
Basic weighted average shares outstanding	98,869,675			97,929,438		98,558,330			97,511,590
Dilutive effect of stock options and restricted stock awards/units	—			669,777		—			597,314
Dilutive weighted average shares outstanding	98,869,675			98,599,215		98,558,330			98,108,904
Basic net (loss) income per share	$	(2.32	)	$	0.25	$	(2.02	)	$	0.70
Diluted net (loss) income per share	$	(2.32	)	$	0.24	$	(2.02	)	$	0.69

For the three months ended June 30, 2017 and 2016, respectively, 3,150,564 and 1,595,791 shares of common stock equivalents were not included in the diluted calculation due to their anti-dilutive effect. For the nine months ended June 30, 2017 and 2016, respectively, 2,715,563 and 2,386,294 shares of common stock equivalents were not included in the diluted calculation due to their anti-dilutive effect.

Note 9. Segment Reporting

We are organized based on geographical location. We conduct our business through two reportable segments: North America and Rest of World.

We evaluate segment performance based primarily on segment income from operations. Each segment reports its results of operations and makes requests for capital expenditures and acquisition funding to our chief operating decision-maker (“CODM”). Our Chief Executive Officer serves as our CODM.

The following tables present operating and financial information by business segment (in thousands):



	Three Months Ended June 30, 2017									Three Months Ended June 30, 2016
	North America			Rest of World			Consolidated			North America			Rest of World			Consolidated
Net sales	$	292,993		$	70,914		$	363,907		$	300,875		$	74,311		$	375,186
(Loss) income from operations	(293,489		)	6,270			(287,219		)	29,267			10,777			40,044
Interest expense, net	(8,688		)	(926		)	(9,614		)	(8,233		)	(1,092		)	(9,325		)
Benefit (provision) for income taxes	68,525			(1,556		)	66,969			(6,868		)	(2,492		)	(9,360		)
Capital expenditures	1,064			1,558			2,622			3,878			50			3,928
Depreciation and amortization	6,451			889			7,340			5,769			1,021			6,790



	Nine Months Ended June 30, 2017									Nine Months Ended June 30, 2016
	North America			Rest of World			Consolidated			North America			Rest of World			Consolidated
Net sales	$	858,568		$	209,309		$	1,067,877		$	889,816		$	221,955		$	1,111,771
(Loss) income from operations	(253,211		)	24,446			(228,765		)	86,380			32,119			118,499
Interest expense, net	(26,890		)	(2,639		)	(29,529		)	(24,073		)	(3,363		)	(27,436		)
Benefit (provision) for income taxes	64,361			(5,415		)	58,946			(19,897		)	(7,009		)	(26,906		)
Capital expenditures	4,475			2,356			6,831			10,616			545			11,161
Depreciation and amortization	18,332			2,480			20,812			17,771			3,072			20,843

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	As of June 30, 2017						As of June 30, 2016
	North America		Rest of World		Consolidated		North America		Rest of World		Consolidated
Total assets	$	1,482,067	$	291,599	$	1,773,666	$	1,700,979	$	289,908	$	1,990,887
Goodwill	204,762		61,882		266,644		515,876		65,483		581,359

Note 10. Income Taxes



	Three Months Ended June 30,						Nine Months Ended June 30,
(dollars in thousands)	2017			2016			2017			2016
Benefit (provision) for income taxes	$	66,969		$	(9,360	)	$	58,946		$	(26,906	)
Effective tax rate	22.6		%	28.0		%	22.8		%	28.3		%

For the three months ended June 30, 2017, our effective tax rate decreased 5.4 percentage points compared to the same period in the prior year. The effective tax rate of 22.6% resulted primarily from (i) a decrease in the proportion of U.S. pre-tax income with a higher tax rate than pre-tax income from foreign jurisdictions, which was caused by the $311.1 million goodwill impairment charge, a portion of which is permanently not deductible for tax purposes and (ii) the establishment of a $10.6 million valuation allowance with respect to deferred tax assets for foreign tax credits. Excluding the impact of the goodwill impairment charge and valuation allowance, the effective tax rate would have been 27.3% for the three months ended June 30, 2017.

For the nine months ended June 30, 2017, our effective tax rate decreased 5.5 percentage points compared to the same period in the prior year. The effective tax rate of 22.8% resulted primarily from (i) a decrease in the proportion of U.S. pre-tax income with a higher tax rate than pre-tax income from foreign jurisdictions, which was caused by the $311.1 million goodwill impairment charge taken during the nine months ended June 30, 2017, a portion of which is permanently not deductible for tax purposes and (ii) the establishment of a $10.6 million valuation allowance with respect to deferred tax assets for foreign tax credits. Excluding the impact of the goodwill impairment charge and valuation allowance, the effective tax rate would have been 22.6% for the nine months ended June 30, 2017. The difference between the adjusted effective tax rate of 22.6% and the effective tax rate of 28.3% for the nine months ended June 30, 2017 and June 30, 2016, respectively, is primarily due to (i) the impact of the adoption of ASU 2016-09 as discussed in Note 2 and (ii) the release of a valuation allowance on a net operating loss carryforward of a foreign subsidiary.

Note 11. Commitments and Contingencies

We are involved in various legal matters that arise in the ordinary course of business. Our management, after consulting with outside legal counsel, believes that the ultimate outcome of such matters will not have a material adverse effect on our business, financial position, results of operations or cash flows. There can be no assurance, however, that such actions will not be material or adversely affect our business, financial position, results of operations or cash flows.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

The following discussion and analysis is intended to help the reader understand our business, financial condition, results of operations, liquidity and capital resources. You should read this discussion in conjunction with our consolidated interim financial statements and the related notes contained elsewhere in this Quarterly Report on Form 10-Q.

The statements in this discussion regarding industry trends, our expectations regarding our future performance, liquidity and capital resources and other non-historical statements are forward-looking statements. These forward-looking statements are subject to numerous risks and uncertainties, including, but not limited to, the risks and uncertainties described in Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on November 28, 2016, as amended by Amendment No. 1 to Annual Report on Form 10-K/A filed with the SEC on December 14, 2016 (collectively, the “2016 Form 10-K”) and “—Cautionary Note Regarding Forward-Looking Statements” and Part II, Item 1A. “Risk Factors” below. Our actual results may differ materially from those contained in or implied by any forward-looking statements.

Unless otherwise noted in this Quarterly Report on Form 10-Q, the term “Wesco Aircraft” means Wesco Aircraft Holdings, Inc., our top-level holding company, and the terms “Wesco,” “the Company,” “we,” “us,” “our” and “our company” mean Wesco Aircraft and its subsidiaries. References to “fiscal year” mean the year ending or ended September 30. For example, “fiscal year 2017” or “fiscal 2017” means the period from October 1, 2016 to September 30, 2017.

Executive Overview

We are the world’s leading distributor and provider of comprehensive supply chain management services to the global aerospace industry, based on annual sales. Our services range from traditional distribution to the management of supplier relationships, quality assurance, kitting, just-in-time (“JIT”) delivery and point-of-use inventory management. We supply over 565,000 active stock-keeping units (“SKUs”), including C-class hardware, chemicals, electronic components, bearings, tools and machined parts. We serve our customers under both (1) long-term contractual arrangements (“Contracts”), which include JIT contracts that govern the provision of comprehensive outsourced supply chain management services and long-term agreements (“LTAs”), that typically set prices for specific products, and (2) ad hoc sales.

Founded in 1953 by the father of our current Chairman of the Board of Directors, Wesco has grown to serve over 7,000 customers, which are primarily in the commercial, military and general aviation sectors, including the leading original equipment manufacturers (“OEMs”) and their subcontractors, through which we support nearly all major Western aircraft programs. We also service industrial customers, which include customers in the automotive, energy, pharmaceutical and electronics sectors.

Industry Trends Affecting Our Business

We rely on demand for new commercial and military aircraft for a significant portion of our sales. Commercial aircraft demand is driven by many factors, including the global economy, industry passenger volumes and capacity utilization, airline profitability, introduction of new models and the lifecycle of current fleets. Demand for business jets is closely correlated to regional economic conditions and corporate profits, but also influenced by new models and changes in ownership dynamics. Military aircraft demand is primarily driven by government spending, the timing of orders and evolving U.S. Department of Defense strategies and policies.

Aftermarket demand is affected by many of the same trends as those in OEM channels, as well as requirements to maintain aging aircraft and the cost of fuel, which can lead to greater utilization of existing planes. Demand in the military aftermarket is further driven by changes in overall fleet size and the level of U.S. military operational activity domestically and overseas.

Supply chain service providers and distributors have been aided by these trends along with an increase in outsourcing activities, as OEMs and their suppliers focus on reducing their capital commitments and operating costs.

Commercial Aerospace Market

Over the past three years, major airlines have ordered new aircraft at a robust pace, aided by strong profits and increasing passenger volumes. At the same time, volatile fuel prices have led to greater demand for fuel-efficient models and new engine options for existing aircraft designs. The rise of emerging markets has added to the growth in overall demand at a

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stronger pace than seen historically. More recently, several airlines have slowed the pace of orders with large commercial OEMs in response to rapidly changing macroeconomic conditions. In spite of this development, large commercial OEMs have indicated that they continue to expect a high level of deliveries, primarily due to their unprecedented level of backlogs. Business aviation has lagged the larger commercial market, reflecting a deeper downturn in the last recession and an uncertain economic outlook. Overall business aviation production levels remain well below their pre-recession peak, though newer models have seen a greater acceptance in the marketplace than older and previously owned aircraft.

Military Aerospace Market

Military build-rates have declined for the past few years (and they may continue to decline going forward), which has negatively affected this portion of our business. We believe the diversity of the military aircraft programs we support can help mitigate the impact of new program delays, changes or cancellations. In particular, we believe the services we provide the Joint Strike Fighter program will benefit our future business as production for that program increases. Increased sales for other established aircraft programs that directly benefit from such changes also help moderate build-rate declines.

Goodwill Impairment

We performed our Step 1 goodwill impairment test on June 30, 2017 on all four reporting units. The results of these tests indicated that the North America Hardware and North America Chemical reporting units were impaired. Lower projected revenue growth and operating results reflected changes in assumptions related to organic growth rates, market trends, business mix, cost structure and other expectations about the anticipated short-term and long-term operating results of these two reporting units, resulting in lower estimated fair values. As a result, we proceeded to Step 2 of the goodwill impairment analysis using the most appropriate valuation methods, including the income approach, to determine the fair value of the net assets of the reporting units (including any intangible assets that may not have any corresponding carrying value in our balance sheet) to calculate the implied value of goodwill. We then compared the implied value of goodwill with the carrying value of the goodwill for each of the impaired reporting units.

In applying the Step 2 analysis to the North America Hardware and North America Chemical reporting units, we determined that the fair value of certain identifiable intangibles including trademarks, customer relationships, and technology exceeded their carrying values by a significant amount which further reduced the implied fair value of goodwill. We recorded a non-cash impairment charge of $240.6 million for North America Hardware and $70.5 million for North America Chemical, for a total impairment charge of $311.1 million in the three months ended June 30, 2017 and after recording the impairment charges, the fair values of these reporting units exceeded their carrying values by 8% and 9%, respectively. The remaining goodwill for the North America Hardware and North America Chemical reporting units was $51.4 million and $153.4 million, respectively, as of June 30, 2017. Any significant changes in the key assumptions used in their fair value estimation such as organic growth rates, new business win rates, working capital requirements and risk adjusted discount rates could change the

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estimated fair values of these two reporting units, resulting in further goodwill impairment. The Rest of World Hardware and Rest of World Chemical reporting units were not impaired with estimated fair values of these reporting units exceeded their carrying values by 105% and 22%, respectively.

Other Factors Affecting Our Financial Results

Fluctuations in Revenue

There are many factors, such as changes in customer aircraft build rates, customer plant shut downs, variation in customer working days, changes in selling prices, the amount of new customers’ consigned inventory and increases or decreases in customer inventory levels, that can cause fluctuations in our financial results from quarter to quarter. To normalize for short-term fluctuations, we tend to look at our performance over several quarters or years of activity rather than discrete short-term periods. As such, it can be difficult to determine longer-term trends in our business based on quarterly comparisons. Ad hoc business tends to vary based on the amount of disruption in the market due to changes in aircraft build rates, new aircraft introduction, customer or site consolidations, and other factors. Fluctuations in our ad hoc business tend to be partially offset by our Contract business as most of our ad hoc revenue comes from our Contract customers.

We will continue our strategy of seeking to expand our relationships with existing ad hoc customers by transitioning them to Contracts, as well as expanding relationships with our existing Contract customers to include additional customer sites, additional SKUs and additional levels of service. New Contract customers and expansion of existing Contract customers to additional sites and SKUs sometimes leads to a corresponding decrease in ad hoc sales as a portion of the SKUs sold under Contracts were previously sold to the same customer as ad hoc sales. We believe this strategy serves to mitigate some of the fluctuations in our net sales. Our sales to Contract customers may fail to meet our expectations for a variety of reasons, in particular if industry build rates are lower than expected or, for certain newer JIT customers, if their consigned inventory, which must be exhausted before corresponding products are purchased directly from us, is greater than we expected.

If any of our customers are acquired or controlled by a company that elects not to utilize our services, or attempt to implement in-sourcing initiatives, it could have a negative effect on our strategy to mitigate fluctuations in our net sales. Additionally, although we derive a significant portion of our net sales from the building of new commercial and military aircraft, we have not typically experienced extreme fluctuations in our net sales when sales for an individual aircraft program decrease, which we believe is attributable to our diverse base of customers and programs.

Fluctuations in Margins

Our gross margins are impacted by changes in product mix. Generally, our hardware products have higher gross profit margins than chemicals and electronic components.

We also believe that our strategy of growing our Contract sales and converting ad hoc customers into Contract customers could negatively affect our gross profit margins, as gross profit margins tend to be higher on ad hoc sales than they are on Contract-related sales. However, we believe any potential adverse impact on our gross profit margins is outweighed by the benefits of a more stable long-term revenue stream attributable to Contract customers.

Our Contracts generally provide for fixed prices, which can expose us to risks if prices we pay to our suppliers rise due to increased raw material or other costs. However, we believe our expansive product offerings and inventories, our ad hoc sales and, where possible, our longer-term agreements with suppliers have enabled us to mitigate this risk. Some of our Contracts are denominated in foreign currencies and fixed prices in these Contracts can expose us to fluctuations in foreign currency exchange rates with the U.S. dollar.

Fluctuations in Cash Flow

Our cash flows are affected by fluctuations in our inventory. When we are awarded new programs, we generally increase our inventory to prepare for expected sales related to the new programs, which often take time to materialize, and to achieve minimum stock requirements, if any. As a result, if certain programs for which we have procured inventory are delayed or if certain newer JIT customers’ consigned inventory is larger than we expected, we may experience a more sustained inventory increase.

Inventory fluctuations may also be attributable to general industry trends. Factors that may contribute to fluctuations in inventory levels in the future could include (1) strategic purchases (a) to take advantage of favorable pricing, (b) made in

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anticipation of the expected industry growth cycle, (c) to support new customer Contracts or (d) to acquire high-volume products that are typically difficult to obtain in sufficient quantities; (2) changes in supplier lead times and the timing of inventory deliveries; (3) purchases made in anticipation of future growth (particularly growth in our MRO business); and (4) purchases made in connection with the expansion of existing Contracts. While effective inventory management is an ongoing challenge, we continue to take steps to enhance the sophistication of our procurement practices to mitigate the negative impact of inventory buildups on our cash flow.

Our accounts receivable balance as a percentage of net sales may fluctuate from quarter to quarter. These fluctuations are primarily driven by changes, from quarter to quarter, in the timing of sales within the quarter and variation in the time required to collect the payments. The completion of customer Contracts with accelerated payment terms can also contribute to these quarter-to-quarter fluctuations. Similarly, our accounts payable may fluctuate from quarter to quarter, which is primarily driven by the timing of purchases or payments made to our suppliers.

Segment Presentation

We conduct our business through two reportable segments: North America and Rest of World. We evaluate segment performance based on segment income or loss from operations. Each segment reports its results of operations and makes requests for capital expenditures and acquisition funding to our chief operating decision maker (CODM). Our Chief Executive Officer serves as our CODM.

Key Components of Our Results of Operations

The following is a discussion of the key line items included in our financial statements for the periods presented below under the heading “Results of Operations.” These are the measures that management utilizes to assess our results of operations, anticipate future trends and evaluate risks in our business.

Net Sales

Our net sales include sales of hardware, chemicals, electronic components, bearings, tools and machined parts, and eliminate all intercompany sales. We also provide certain services to our customers, including quality assurance, kitting, JIT delivery and point-of-use inventory management. However, these services are provided by us contemporaneously with the delivery of the product, and as such, once the product is delivered, we do not have a post-delivery obligation to provide services to the customer. Accordingly, the price of such services is generally included in the price of the products delivered to the customer, and revenue is recognized upon delivery of the product, at which point, we have satisfied our obligations to the customer. We do not account for these services as a separate element, as the services generally do not have stand-alone value and cannot be separated from the product element of the arrangement.

We serve our customers under both Contracts, which include JIT contracts and LTAs, and ad hoc sales. Under JIT contracts, customers typically commit to purchase specified products from us at a fixed price, on an if-and-when needed basis, and we are responsible for maintaining high levels of stock availability of those products. LTAs are typically negotiated price lists for customers or individual customer sites that cover a range of pre-determined products, purchased on an as-needed basis. Ad hoc customers purchase products from us on an as-needed basis and are generally supplied out of our existing inventory. In addition, Contract customers often purchase products that are not captured under their Contract on an ad hoc basis.

(Loss) Income from Operations

(Loss) income from operations is the result of subtracting the cost of sales and selling, general and administrative (SG&A) expenses from net sales, and is used primarily to evaluate our performance and profitability.

The principal component of our cost of sales is product cost, which was 94.4% and 93.0% of our total cost of sales for the nine months ended June 30, 2017 and 2016, respectively. The remaining components are freight and expediting fees, import duties, tooling repair charges, supplies and contract labor costs.

Product cost is determined by the current weighted average cost of each inventory item, except for chemical parts for which the first-in, first-out method is used, and includes charges, if any, to write down excess and obsolete (“E&O”) inventory to its net realizable value. The charge to write down E&O inventory is calculated by comparing our forecasted demand for each part to the quantity we currently have on hand. We review inventory for excess quantities and obsolescence quarterly. For a description of our E&O inventory policy, see Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates—Inventory” in the 2016 Form 10-K. During the three

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months ended June 30, 2017 and 2016, we recorded a charge of $3.8 million and $3.2 million, respectively, and during the nine months ended June 30, 2017 and 2016, we recorded a charge of $9.1 million and $9.6 million, respectively, to cost of sales to write down E&O inventory to its net realizable value.

The principal components of our SG&A expenses are salaries, wages, benefits and bonuses paid to our employees; stock-based compensation; commissions paid to outside sales representatives; travel and other business expenses; training and recruitment costs; marketing, advertising and promotional event costs; rent; bad debt expense; professional services fees (including legal, audit and tax); and ordinary day-to-day business expenses. Depreciation and amortization expense is also included in SG&A expenses, and consists primarily of scheduled depreciation for leasehold improvements, machinery and equipment, vehicles, computers, software and furniture and fixtures. Depreciation and amortization also includes intangible asset amortization expense.

Other Expenses

Interest Expense, Net. Interest expense, net consists of the interest we pay on our long-term debt, fees on our revolving facility (as defined below under “—Liquidity and Capital Resources—Credit Facilities—Senior Secured Credit Facilities”) and our line-of-credit and deferred financing costs, net of interest income.

Other Income (Expense), Net. Other income (expense), net is primarily comprised of foreign currency exchange gain net of foreign currency exchange loss associated with transactions denominated in currencies other than the respective functional currency of the reporting subsidiary, partially offset by the gain or loss on foreign currency forward contracts.

Critical Accounting Policies and Estimates

The methods, estimates and judgments we use in applying our most critical accounting policies have a significant impact on the results we report in our financial statements. We evaluate our estimates and judgments on an on-going basis. We base our estimates on historical experience and on assumptions that we believe to be reasonable under the circumstances. Our experience and assumptions form the basis for our judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may vary from what we anticipate, and different assumptions or estimates about the future could change our reported results. For a description of our critical accounting policies and estimates, see Part II, Item 7. “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Estimates” in the 2016 Form 10-K.

Results of Operations



	Three Months Ended June 30,						Nine Months Ended June 30,
(In thousands)	2017			2016			2017			2016
Consolidated result of operations:
Net sales:
North America	$	292,993		$	300,875		$	858,568		$	889,816
Rest of World	70,914			74,311			209,309			221,955
Total net sales	$	363,907		$	375,186		$	1,067,877		$	1,111,771

(Loss) income from operations:
North America	$	(293,489	)	$	29,267		$	(253,211	)	$	86,380
Rest of World	6,270			10,777			24,446			32,119
Total (loss) income from operations	(287,219		)	40,044			(228,765		)	118,499
Interest expense, net	(9,614		)	(9,325		)	(29,529		)	(27,436		)
Other income, net	256			2,657			289			3,960
(Loss) income before provision for income taxes	(296,577		)	33,376			(258,005		)	95,023
Benefit (provision) for income taxes	66,969			(9,360		)	58,946			(26,906		)
Net (loss) income	$	(229,608	)	$	24,016		$	(199,059	)	$	68,117

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	Three Months Ended June 30,				Nine Months Ended June 30,
(As a % of total net sales; numbers have been rounded)	2017		2016		2017		2016
(Loss) income from operations by segment:
North America	(100.2	)%	9.7	%	(29.5	)%	9.7	%
Rest of World	8.8	%	14.5	%	11.7	%	14.5	%

Consolidated:
(Loss) income from operations	(78.9	)%	10.7	%	(21.4	)%	10.7	%
Interest expense, net	(2.6	)	(2.5	)	(2.8	)	(2.5	)
Other (expense) income, net	—		0.7		—		0.3
(Loss) income before provision for income taxes	(81.5	)	8.9		(24.2	)	8.5
Benefit (provision) for income taxes	18.4		(2.5	)	5.6		(2.4	)
Net (loss) income	(63.1	)%	6.4	%	(18.6	)%	6.1	%

Three Months Ended June 30, 2017 compared with Three Months Ended June 30, 2016

Net Sales

Consolidated net sales decreased $11.3 million, or 3.0%, to $363.9 million for the three months ended June 30, 2017, compared with $375.2 million for the same period in the prior year. Foreign currency translation impacts reduced sales by $0.8 million. Excluding foreign currency translation impacts, net sales for the three months ended June 30, 2017 decreased $10.5 million compared to the three months ended June 30, 2016. The $10.5 million decrease was due to a $10.2 million decrease in ad hoc sales and a decrease in Contract sales of $0.3 million. The decline in ad hoc sales was primarily due to production schedule changes and customer service issues. A significant portion of our ad hoc revenue comes from the discretionary purchases of our major contract customers. When our delivery performance to those customers declines, we earn less of their discretionary purchases. Although the $20.0 million increase in Contracts sales from new contracts well exceeded declines from lost contracts, we also saw a decline in existing contract volumes which offset the net gain. The decline was driven by changes in customer production schedule and customer service issues. Ad hoc and Contract sales as a percentage of net sales represented 24% and 76%, respectively, for the three months ended June 30, 2017 as compared to 26% and 74%, respectively, for the same period in the prior year.

Net sales for our North America segment decreased $7.9 million, or 2.6%, to $293.0 million for the three months ended June 30, 2017, compared with $300.9 million for the same period in the prior year. The $7.9 million decrease was due to a decrease in ad hoc sales of $10.3 million partially offset by an increase in Contract sales of $2.4 million. The decrease in ad hoc sales was due to customer production schedule changes and customer service issues. The $2.4 million increase in Contract sales was primarily the result of new contracts in excess of lost business, partially offset by a decline in existing contract volumes.

Net sales for our Rest of World segment decreased $3.4 million, or 4.6%, to $70.9 million for the three months ended June 30, 2017, compared with $74.3 million for the same period in the prior year. Foreign currency translation impacts reduced sales by $0.8 million. Excluding foreign currency translation impacts, net sales for the three months ended June 30, 2017 decreased $2.6 million compared to the same period in the prior year. The $2.6 million decrease was due to a decrease in Contract sales of $2.8 million partially offset by an increase in ad hoc sales of $0.2 million. The $2.8 million decrease in Contract sales was mainly driven by a decline in existing contract volumes partially offset by new contracts in excess of lost business.

(Loss) Income from Operations

Consolidated loss from operations was $287.2 million for the three months ended June 30, 2017 due to the $311.1 million non-cash goodwill impairment charge partially offset by $23.9 million in income from operations. Income from operations excluding goodwill impairment decreased $16.1 million, or 40.3%, compared with $40.0 million of income from operations for the same period in the prior year. Excluding the goodwill impairment, income from operations as a percentage of net sales was 6.6% for the three months ended June 30, 2017, compared to 10.7% for the three months ended June 30, 2016, a

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decrease of 4.1 percentage points. Average gross margins decreased 1.7 percentage points and SG&A as a percent of net sales increased by 2.4 percentage points. The $16.1 million decrease in income from operations was comprised of a decrease in gross profit of $9.0 million and an increase in SG&A expenses of $7.1 million. The foreign currency translation impact on gross profit was a decrease of $0.6 million. The remaining $8.4 million decrease in gross profit was primarily driven by the decline in gross margins and, to a lesser extent, by a decrease in net sales on a constant currency basis. The 1.7 percentage point decline in gross margins was due primarily to a decrease in ad hoc margins compared to the same period of the prior year, which were unusually high and due to additional declines in the Rest of World segment. The 2.4 percentage point increase in SG&A as a percent of sales was due primarily to the increase in SG&A expenses and to a lesser extent to deleveraging. The increase in SG&A expenses was $7.6 million after adjusting for the $0.5 million impact of foreign currency translation, which was largely driven by increases in payroll and other people costs of $4.8 million, rent expense of $1.1 million, IT related costs of $0.8 million, bad debt of $0.8 million, group insurance of $0.8 million, depreciation expense of $0.8 million and travel expenses of $0.6 million. The increase in payroll and other people costs was due in part to increased staffing to support new business. These increases were partially offset by decreases in non-cash stock based compensation of $1.4 million, commissions of $0.8 million and $0.5 million of professional fees.

Loss from operations for our North America segment was $293.5 million due to the $311.1 million non-cash goodwill impairment charge partially offset by $17.6 million in income from operations. Income from operations excluding goodwill impairment decreased $11.6 million, or 39.8%, compared with $29.3 million of income from operations for the same period in the prior year. Excluding the goodwill impairment, income from operations as a percentage of net sales was 6.0% for the three months ended June 30, 2017, compared to 9.7% for the three months ended June 30, 2016, a decrease of 3.7 percentage points. Average gross margins decreased 1.1 percentage points and SG&A as a percent of net sales increased by 2.6 percentage points. The $11.6 million decrease in income from operations, excluding goodwill impairment, was comprised of a decrease in gross profit of $5.1 million and an increase in SG&A expenses of $6.5 million. The decline in gross profit was primarily driven by a decline in gross margins and, to a lesser extent, by a decrease in sales. The 1.1 percentage point decline in gross margins compared to the same period of the prior year was due primarily to a decrease in ad hoc margins. The 2.6 percentage point increase in SG&A as a percent of sales was primarily due to increases in payroll and other people costs of $4.2 million, rent expense of $1.1 million, IT related costs of $0.8 million, group insurance of $0.8 million, bad debt of $0.7 million, depreciation expense of $0.7 million and travel expenses of $0.4 million. The increase in payroll and other people costs was due in part to increased staffing to support new business. These increases were partially offset by decreases in non-cash stock based compensation of $1.4 million, commissions of $0.8 million and $0.5 million of professional fees.

Income from operations for our Rest of World segment decreased $4.5 million, or 41.8%, to $6.3 million, compared with $10.8 million for the same period in the prior year. Income from operations as a percentage of net sales was 8.8% for the three months ended June 30, 2017, compared to 14.5% for the same period in the prior year, a decrease of 5.7 percentage points. Average gross margins decreased 4.1 percentage points and SG&A as a percent of net sales increased by 1.6 percentage points. The $4.5 million decrease in income from operations was the result of a decrease in gross profit of $3.9 million and an increase in SG&A expenses of $0.6 million. The foreign currency translation impact on gross profit was a decrease of $0.6 million. The remaining $3.3 million decrease in gross profit was due primarily to the 4.1 percentage point decline in gross margin and to a lesser extent to the 4.6% decline in revenue. The decline in gross margin was primarily driven by lower ad hoc gross margins, which were unusually high in the prior year, a favorable inventory adjustment in the prior year, and higher freight and expedite costs. The 1.6 percentage point increase in SG&A as a percent of revenue is due both to deleveraging SG&A as well as to an increase in SG&A expenses. Excluding $0.5 million impact of foreign currency translation, SG&A expenses increased by $1.1 million, largely driven by increases in payroll and other people costs of $0.6 million and travel expenses of $0.2 million.

Interest Expense, Net

Interest expense, net was $9.6 million for the three months ended June 30, 2017, compared with $9.3 million for the same period in the prior year. The increase was primarily due to the additional interest expense as a result of our borrowing against the revolving facility, partially offset by a lower average long-term debt balance compared to the same period of the prior year.

Other Income, Net

Other income, net was $0.3 million for the three months ended June 30, 2017, compared with other income, net of $2.7 million for the same period in the prior year. The $2.4 million decrease was primarily related to lower net foreign currency exchange gains associated with transactions denominated in currencies other than the respective functional currency of the reporting subsidiary.

Benefit (Provision) for Income Taxes

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The income taxes benefit for the three months ended June 30, 2017 was $67.0 million, compared with a $9.4 million income tax provision for the same period in the prior year. The change in income tax provision compared to the same period of the prior year is primarily due to the tax benefit associated with the goodwill impairment charge. Our effective tax rate was 22.6% and 28.0% for the three months ended June 30, 2017 and 2016, respectively. The 5.4 percentage point decline in effective tax rate resulted primarily from (i) a decrease in the proportion of U.S. pre-tax income with a higher tax rate than pre-tax income from foreign jurisdictions, which was caused by the $311.1 million goodwill impairment charge, a portion of which is permanently not deductible for tax purposes and (ii) the establishment of a $10.6 million valuation allowance with respect to deferred tax assets for foreign tax credits. Excluding the impact of the goodwill impairment charge and valuation allowance, the effective tax rate would have been 27.3% for the three months ended June 30, 2017.

Net (Loss) Income

Net loss for the three months ended June 30, 2017 was $229.6 million, compared with net income of $24.0 million for the same period in the prior year. This decrease in net income was primarily driven by a non-cash goodwill impairment charge and a decrease in operating income, partially offset by a decrease in provision for income taxes, as discussed above.

Nine Months Ended June 30, 2017 compared with Nine Months Ended June 30, 2016

Net Sales

Consolidated net sales decreased $43.9 million, or 3.9%, to $1,067.9 million for the nine months ended June 30, 2017, compared with $1,111.8 million for the same period in the prior year. Foreign currency translation impacts reduced sales by $23.7 million. Excluding foreign currency translation impacts, net sales for the nine months ended June 30, 2017 decreased $20.2 million compared to the same period in prior year. The $20.2 million decrease was due to a decrease in ad hoc sales of $20.4 million, partially offset by an increase in Contract sales of $0.2 million. The decline in ad hoc sales was primarily due production schedule changes and customer service issues. This reduction in customer production days and customer service issues affected both ad hoc and Contract sales; however, other increases in contract sales, related both to increases in contract volume and new contracts, more than offset this impact. Contract sales for the nine months ended June 30, 2016 included $9.8 million related to a large commercial hardware contract that ended on March 31, 2015. Excluding this $9.8 million, which did not repeat in the corresponding 2017 period, Contract sales increased $10.1 million due to increases in contract volume and new contracts. Ad hoc and Contract sales as a percentage of net sales represented 24% and 76%, respectively, for the nine months ended June 30, 2017 as compared to 25% and 75%, respectively, for the same period in the prior year.

Net sales for our North America segment decreased $31.2 million, or 3.5%, to $858.6 million for the nine months ended June 30, 2017, compared with $889.8 million for the same period in the prior year. The $31.2 million decrease was due to a decrease in ad hoc sales of $25.9 million and a decrease in Contract sales of $5.3 million. The $25.9 million decline in ad hoc sales was primarily due to production schedule changes and customer service issues. The $5.3 million decrease in Contract sales was primarily the result of the $9.8 million impact of the conclusion of a large commercial hardware contract as discussed above, partially offset by other increases in Contract sales, related both to increases in contract volume and new contracts.

Net sales for our Rest of World segment decreased $12.6 million, or 5.7%, to $209.3 million for the nine months ended June 30, 2017, compared with $222.0 million for the same period in the prior year. Foreign currency translation impacts reduced sales by $23.7 million. Excluding foreign currency translation impacts, net sales for the nine months ended June 30, 2017 increased $11.1 million compared to the same period in the prior year. The $11.1 million increase was due to ad hoc sales growth of $5.5 million and Contract sales growth of $5.6 million that was primarily due to increased production and expanded content.

(Loss) Income from Operations

Consolidated loss from operations was $228.8 million for the nine months ended June 30, 2017 due to the non-cash goodwill impairment charge of $311.1 million partially offset by $82.3 million in income from operations. Income from operations excluding goodwill impairment decreased $36.2 million, or 30.5%, compared with $118.5 million of income from operations for the same period in the prior year. Excluding the goodwill impairment, income from operations as a percentage of net sales was 7.7% for the nine months ended June 30, 2017, compared to 10.7% for the nine months ended June 30, 2016, a decrease of 3.0 percentage points. Average gross margins decreased 1.1 percentage points and SG&A as a percent of net sales increased by 1.9 percentage points. The $36.2 million decrease in income from operations was comprised of a decrease in gross profit of $23.8 million and an increase in SG&A expenses of $12.4 million. The foreign currency translation impact on gross profit was a decrease of $7.7 million. The remaining $16.1 million decrease in gross profit was primarily driven by the decline

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in gross margins and the decrease in sales on a constant currency basis. The 1.1 percentage point decline in gross margins was due primarily to changes in product mix and to a decrease in ad hoc margins compared to the same period of the prior year. The increase in SG&A expenses was $17.1 million after adjusting for the $4.7 million impact of foreign currency translation, which was largely driven by increases in payroll and other people costs of $12.7 million, IT related costs of $2.8 million, rent expense of $1.1 million, travel expenses of $1.1 million, repair and maintenance costs of $0.9 million, depreciation expense of $0.7 million and delivery expenses of $0.5 million. The increase in payroll and other people costs was due in part to increased staffing required to begin implementing new contracts. These increases were partially offset by decreases in professional fees of $2.9 million and in non-cash stock based compensation of $0.4 million.

Loss from operations for our North America segment for the nine months ended June 30, 2017 was $253.2 million due to the non-cash goodwill impairment charge of $311.1 million partially offset by $57.9 million in income from operations. Income from operations excluding goodwill impairment decreased $28.5 million, or 33.0%, compared with $86.4 million of income from operations for the same period in the prior year. Excluding the goodwill impairment, income from operations as a percentage of net sales was 6.7% for the nine months ended June 30, 2017, compared to 9.7% for the nine months ended June 30, 2016, a decrease of 3.0 percentage points. Average gross margins decreased 0.8 percentage points and SG&A as a percent of net sales increased by 2.2 percentage points. The $28.5 million decrease in income from operations was comprised of a decrease in gross profit of $14.8 million and an increase in SG&A expenses of $13.7 million. The $14.8 million decrease in gross profit was primarily driven by decreased net sales, and a decrease in gross margins caused by changes in sales mix, partially offset by a decrease in write downs of E&O inventory. The $13.7 million increase in SG&A expenses was largely driven by increases in payroll and other people related costs of $10.1 million, IT related costs of $2.8 million, rent expense of $1.1 million, repair and maintenance costs of $0.8 million, depreciation expense of $0.7 million, travel expenses of $0.6 million and delivery costs of $0.5 million. These increases were partially offset by decreases in professional fees of $2.9 million and in non-cash stock based compensation of $0.4 million.

Income from operations for our Rest of World segment decreased $7.7 million, or 23.9%, to $24.4 million, compared with $32.1 million for the same period in the prior year. Income from operations as a percentage of net sales was 11.7% for the nine months ended June 30, 2017, compared to 14.5% for the same period in the prior year, a decrease of 2.8 percentage points. Average gross margins decreased 2.5 percentage points and SG&A as a percent of net sales decreased by 0.3 percentage points. The decrease in income from operations was comprised of a $9.0 million decrease in gross profit, offset by a $1.3 million decrease in SG&A expenses. The $9.0 million decrease in gross profit was primarily due to a $7.7 million decrease from foreign currency translation impact. The remaining $1.3 million decrease in gross profit was primarily driven by lower ad hoc margin and higher freight and expedite costs. Excluding $4.7 million impact of foreign currency translation, SG&A expenses increased by $3.4 million, largely driven by increases in payroll and other people costs of $2.3 million and travel expenses of $0.6 million, partially offset by a decrease in bad debt expense of $0.4 million.

Interest Expense, Net

Interest expense, net was $29.5 million for the nine months ended June 30, 2017, compared with $27.4 million for the same period in the prior year. The increase was primarily due to $2.3 million of deferred financing costs written off in the nine months ended June 30, 2017 as debt extinguishment loss related to the Credit Agreement (as defined and described in Note 6 of Notes to the Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q) as well as additional interest expense as a result of our borrowing against the revolving facility offset by a decrease of interest expense due to a lower average long-term debt balance compared to the same period of the prior year.

Other Income, Net

Other income, net was $0.3 million for the nine months ended June 30, 2017, compared with other income, net of $4.0 million for the same period in the prior year. The $3.7 million decrease in other income was primarily related to lower net foreign currency exchange gains associated with transactions denominated in currencies other than the respective functional currency of the reporting subsidiary.

Benefit (Provision) for Income Taxes

The income taxes benefit for the nine months ended June 30, 2017 was $58.9 million, compared with a $26.9 million income tax provision for the same period in the prior year. The change in income tax provision compared to the same period of the prior year is primarily due to the tax benefit associated with the goodwill impairment charge. Our effective tax rate was 22.8% and 28.3% for the nine months ended June 30, 2017 and 2016, respectively. The 5.5 percentage point decline in effective tax rate resulted primarily from (i) a decrease in the proportion of U.S. pre-tax income with a higher tax rate than pre-tax income from foreign jurisdictions, which was caused by the $311.1 million goodwill impairment charge, a portion of which is

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permanently not deductible for tax purposes and (ii) the establishment of a $10.6 million valuation allowance with respect to deferred tax assets for foreign tax credits. Excluding the impact of the goodwill impairment charge and valuation allowance, the effective tax rate would have been 22.6% for the nine months ended June 30, 2017. The difference between the adjusted effective tax rate of 22.6% and the effective tax rate of 28.3% for the nine months ended June 30, 2017 and June 30, 2016, respectively, is primarily due to (i) the impact of the adoption of ASU 2016-09 as discussed in Note 2 and (ii) the release of a valuation allowance on a net operating loss carryforward of a foreign subsidiary.

Net (Loss) Income

Net loss for the nine months ended June 30, 2017 was $199.1 million, compared with net income of $68.1 million for the same period in the prior year. This decrease in net income was primarily driven by a non-cash goodwill impairment charge of $311.1 million, a decrease in gross profit of $23.8 million, and an increase in SG&A expenses of $12.4 million, partially offset by a benefit for income taxes, as discussed above.

Liquidity and Capital Resources

Overview

Our primary sources of liquidity are cash flow from operations and available borrowings under our revolving facility. We have historically funded our operations, debt payments, capital expenditures and discretionary funding needs from our cash from operations. We had total available cash and cash equivalents of $57.1 million and $77.1 million as of June 30, 2017 and September 30, 2016, respectively, of which $44.8 million, or 78.6%, and $53.3 million, or 69.2%, was held by our foreign subsidiaries as of June 30, 2017 and September 30, 2016, respectively. None of our cash and cash equivalents consisted of restricted cash and cash equivalents as of June 30, 2017 or September 30, 2016. All of our foreign cash and cash equivalents are readily convertible into U.S. dollars or other foreign currencies. Our strategic plan does not require the repatriation of foreign cash in order to fund our operations in the U.S. and it is our current intention to permanently reinvest our foreign cash and cash equivalents outside of the U.S. If we were to repatriate foreign cash to the U.S., we may be required to accrue and pay U.S. taxes in accordance with applicable U.S. tax rules and regulations as a result of the repatriation. Our primary uses of cash are for:



•	operating expenses;
•	working capital requirements to fund the growth of our business;
•	capital expenditures that primarily relate to IT equipment and our warehouse operations;
•	debt service requirements for borrowings under the Credit Facilities (as defined below under “—Credit Facilities—Senior Secured Credit Facilities”); and
•	strategic acquisitions.

Generally, cash provided by operating activities has been adequate to fund our operations. Due to fluctuations in our cash flows and the growth in our operations, it may be necessary from time to time to borrow under our revolving facility to meet cash demands. We anticipate that cash provided by operating activities, cash and cash equivalents and borrowing capacity under our revolving facility will be sufficient to meet our cash requirements for the next twelve months. For additional information about our revolving facility, see “—Credit Facilities—Senior Secured Credit Facilities” below. As of June 30, 2017, we did not have any material capital expenditure commitments.

Cash Flows

Our cash and cash equivalents decreased by $20.0 million during the nine months ended June 30, 2017. The decrease was primarily due to cash used in operating activities.

A summary of our operating, investing and financing activities are shown in the following table (in thousands):

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	Nine Months Ended June 30,
Consolidated statements of cash flows data:	2017			2016

Net cash (used in) provided by operating activities	$	(32,846	)	$	66,593
Net cash used in investing activities	(6,831		)	(9,161		)
Net cash provided by (used in) financing activities	20,283			(72,241		)

Operating Activities

Our cash flows from operations fluctuates based on the level of profitability during the period as well as the timing of investments in inventory, collections of cash from our customers, payments of cash to our suppliers, and other changes in working capital accounts such as changes in our prepaid expenses and accrued liabilities or the timing of our tax payments.

Our operating activities used $32.8 million of cash in the nine months ended June 30, 2017. The primary use of cash was a $91.6 million increase in inventory due chiefly to required stocking levels on new contracts being implemented and for adequately supporting ad hoc sales. Our primary source of operating cash flow is cash received from customers. During the nine months ended June 30, 2017, operating cash flows from net income adjusted for non-cash expenses was $82.0 million. The remaining use of cash for operations included an increase in accounts receivable of $16.0 million, a decrease in accounts payable of $5.7 million and $1.5 million of net changes in other working capital accounts. We expect to continue investing in inventory in the near term to support new business wins and ad hoc sales.

Investing Activities

Our business is not capital intensive and capital expenditures are normally limited and relate primarily to computer hardware and software and warehouse equipment. Our purchases of property and equipment may vary from period to period due to the timing of the expansion of our business and the investment requirements to provide us with technology that allows us to better serve our customers. During the nine months ended June 30, 2017, $6.8 million was used for the purchase of property and equipment.

Financing Activities

Cash provided by our financing activities totaled $20.3 million in the nine months ended June 30, 2017. We borrowed $60.0 million on the revolving facility (as defined below) to fund our working capital needs and paid $12.8 million in financing fees (for additional information about our financing fees, see Note 6 of the Notes to Consolidated Financial Statements in Part I, Item 1. of this Quarterly Report on Form 10-Q). During the nine months ended June 30, 2017, we voluntarily repaid $12.0 million of the revolving facility borrowings and made three required quarterly principal payments totaling $15.0 million and a voluntary prepayment of $1.3 million on the term loan A facility (as defined below). We also repaid $1.3 million in capital lease obligations and received proceeds from the issuance of common stock in connection with stock option exercises of $2.9 million. We expect to borrow and to repay borrowings under the revolving facility in response to the quarterly fluctuations in operating cash flow and to fund our temporary investment in inventory for new business.

Credit Facilities

Senior Secured Credit Facilities

The credit agreement, dated as of December 7, 2012 (as amended, the "Amended Credit Agreement"), by and among the Company, Wesco Aircraft Hardware (the “Borrower”) and the lenders and agents party thereto, which governs our senior secured credit facilities, provides for (1) a $400.0 million senior secured term loan A facility (the “term loan A facility”), (2) a $180.0 million revolving facility (the “revolving facility”), and (3) a $525.0 million senior secured term loan B facility (the “term loan B facility”). We refer to the term loan A facility, the revolving facility and the term loan B facility, together, as the “Credit Facilities.” See Note 6 of the Notes to the Consolidated Financial Statements in Part 1, Item 1. of this Quarterly Report on Form 10-Q for a summary of the Credit Facilities and the Amended Credit Agreement.

As of June 30, 2017, our outstanding indebtedness under our Credit Facilities was $873.6 million, which consisted of (1) $385.0 million of indebtedness under the term loan A facility, (2) $48.0 million of indebtedness under the revolving facility, and (3) $440.6 million of indebtedness under the term loan B facility. As of June 30, 2017, $132.0 million was available for

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borrowing under the revolving facility, of which we could use up to $39.3 million to fund our operating and investing activities without breaching any covenants contained in our Amended Credit Agreement.

As referred to above, our borrowings under the Credit Facilities are subject to a financial covenant based upon our Consolidated Total Leverage Ratio with the maximum ratio currently set at 4.50, which will step down to 4.25 for the quarter ending December 31, 2017 and will continue to step down gradually during future quarters to 3.50 for the quarter ending June 30, 2019 and thereafter. We have been operating within a narrow margin of our Consolidated Total Leverage Ratio and will continue monitoring our earnings and cash flow projections to determine when and if actions are necessary, including potentially seeking an appropriate covenant waiver or amendment or refinancing of our debt, to maintain compliance with the ratios as they step down according to this schedule. As of June 30, 2017, we were in compliance with all of the foregoing covenants, and our Consolidated Total Leverage Ratio was 4.29.

The Amended Credit Agreement also contains customary negative covenants, including restrictions on our and our restricted subsidiaries’ ability to merge and consolidate with other companies, incur indebtedness, grant liens or security interests on assets, make acquisitions, loans, advances or investments, pay dividends, sell or otherwise transfer assets, optionally prepay or modify terms of any junior indebtedness or enter into transactions with affiliates. A breach of the Consolidated Total Leverage Ratio covenant or any of other covenants contained in the Amended Credit Agreement could result in an event of default in which case the lenders may elect to declare all outstanding amounts to be immediately due and payable. If the debt under the Credit Facilities were to be accelerated, our available cash would not be sufficient to repay in full our debt.

UK Line of Credit

Off-Balance Sheet Arrangements

We are not a party to any off-balance sheet arrangements.

Recent Accounting Pronouncements

See Note 2 of the Notes to the Consolidated Financial Statements in Part I, Item 1 of this Quarterly Report on Form 10-Q for a summary of recent accounting pronouncements.

Cautionary Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements (including within the meaning of the Private Securities Litigation Reform Act of 1995) concerning Wesco and other matters. These statements may discuss goals, intentions and expectations as to future plans, trends, events, results of operations or financial condition, or otherwise, based on current beliefs of management, as well as assumptions made by, and information currently available to, management. Forward-looking statements may be accompanied by words such as “achieve,” “anticipate,” “believe,” “can,” “continue,” “could,” “drive,” “estimate,” “expect,” “forecast,” “future,” “grow,” “improve,” “increase,” “intend,” “may,” “outlook,” “plan,” “possible,” “potential,” “project,” “should,” “target,” “will,” “would” or similar words, phrases or expressions. These forward-looking statements are subject to various risks and uncertainties, many of which are outside our control. Therefore, you should not place undue reliance on such statements.

Factors that could cause actual results to differ materially from those in the forward-looking statements include, but are not limited to, the following: general economic and industry conditions; conditions in the credit markets; changes in military spending; risks unique to suppliers of equipment and services to the U.S. government; risks associated with our long-term, fixed-price agreements that have no guarantee of future sales volumes; risks associated with the loss of significant customers, a material reduction in purchase orders by significant customers or the delay, scaling back or elimination of significant programs on which we rely; our ability to effectively compete in our industry; our ability to effectively manage our inventory; our suppliers’ ability to provide us with the products we sell in a timely manner, in adequate quantities and/or at a reasonable cost;

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our ability to maintain effective information technology systems; our ability to retain key personnel; risks associated with our international operations, including exposure to foreign currency movements; risks associated with assumptions we make in connection with our critical accounting estimates (including goodwill) and legal proceedings; our dependence on third-party package delivery companies; fuel price risks; fluctuations in our financial results from period-to-period; environmental risks; risks related to the handling, transportation and storage of chemical products; risks related to the aerospace industry and the regulation thereof; risks related to our indebtedness; and other risks and uncertainties.

The foregoing list of factors is not exhaustive. You should carefully consider the foregoing factors and the other risks and uncertainties that affect our business, including those described under Part I, Item 1A. “Risk Factors” in the 2016 Form 10-K and the other documents we file from time to time with the SEC, including this Quarterly Report on Form 10-Q. All forward-looking statements included in this Quarterly Report on Form 10-Q (including information included or incorporated by reference herein) are based upon information available to us as of the date hereof, and we undertake no obligation to update or revise publicly any forward-looking statements, whether as a result of new information, future events or otherwise.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISKS.

For a description of our exposure to market risks, see Part II, Item 7A “Quantitative and Qualitative Disclosures About Market Risks” in the 2016 Form 10-K. There have been no material changes to our market risks since September 30, 2016, except as already disclosed in the 2016 Form 10-K under the sub-heading “Interest Rate Risk” regarding the Amendment to our Credit Agreement on October 4, 2016 and as noted below.

As previously disclosed, on April 1, 2017, due to an internal reorganization which combined the operations of several different legal entities, our U.K. operations began operating under a new subsidiary, Wesco Aircraft EMEA, Ltd. (“Wesco EMEA”) with a U.S. dollar functional currency. Our operations in the U.K. have revenue and costs primarily in U.S. dollars, as well as in British pounds and Euros. The change to a U.S. dollar functional currency for our operations in the U.K. will change the nature of the foreign currency impacts on our financial results on an economic impact, translation impact, and transactional gain or loss basis. This reorganization is expected to eliminate the foreign currency translation risk associated with our U.K. operations and to make the management of transactional gains and losses easier and less expensive. Regarding the economic impact of foreign currency movements, Wesco EMEA’s revenues and product costs are predominately denominated in U.S. dollars and its operating expenses are predominately denominated in British pounds. Accordingly, changes in the exchange rate between U.S. dollars and British pounds will cause the operating margins of Wesco EMEA to expand or contract.

ITEM 4. CONTROLS AND PROCEDURES.

Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act), as of the end of the period covered by this report. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of the end of the period covered by this report were effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting that occurred during the three months ended June 30, 2017 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II — OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS.

We are involved in various legal matters that arise in the ordinary course of our business. We believe that the ultimate outcome of such matters will not have a material adverse effect on our business financial condition or results of operations.

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However, there can be no assurance that such actions will not be material or adversely affect our business, financial condition or results of operations.

ITEM 1A. RISK FACTORS.

The risk factor presented below has been revised to reflect the $311.1 million goodwill impairment charge we recorded during the three months ended June 30, 2017.

Our total assets include substantial intangible assets, and the write-off of a significant portion of our intangible assets would negatively affect our financial results.

Our total assets reflect substantial intangible assets. At June 30, 2017, goodwill and intangible assets, net represented 25.3% of our total assets. Goodwill represents the excess of the purchase price of acquired businesses over the fair value of the assets acquired and liabilities assumed resulting from acquisitions, including the acquisition of our Company by affiliates of The Carlyle Group (Carlyle) and the acquisition of Haas. Intangible assets represent trademarks, backlogs, non-compete agreements, technology and customer relationships. On at least an annual basis, we assess whether there has been impairment in the value of goodwill and indefinite-lived intangible assets. If our testing identifies impairment under generally accepted accounting principles in the United States (GAAP), the impairment charge we calculate would result in a charge to income from operations. For example, during the three months ended June 30, 2017, we recorded a non-cash goodwill impairment charge of $240.6 million for our North America Hardware reporting unit and $70.5 million for our North America Chemical reporting unit, for a total impairment charge of $311.1 million in the three months ended June 30, 2017. Any determination requiring the write-off of a significant portion of goodwill and unamortized identified intangible assets would negatively affect our results of operations and total capitalization, which could be material.

There have been no other material changes to the risk factors disclosed in Part I, Item 1A. “Risk Factors” of the 2016 Form 10-K, as supplemented by Part II, Item 1A. “Risk Factors” in the Company's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2017, filed with the SEC on May 10, 2017.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

None.

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.

(a) Exhibits



Exhibit Number			Description

10.1			Separation and Release Agreement, by and among Wesco Aircraft Holdings, Inc., Wesco Aircraft Hardware Corp. and David J. Castagnola, dated as of April 27, 2017 (Incorporated by reference to Exhibit 10.1 to the Registrant’s Current Report on Form 8-K dated April 28, 2017 (File No. 001-35253))

31.1			Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a) and pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)

31.2			Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a) and pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 (filed herewith)

32.1			Certification of Periodic Report by Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith)

101.INS			XBRL Instance Document

101.SCH			XBRL Taxonomy Extension Schema Document

101.CAL			XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF			XBRL Taxonomy Extension Definition Linkbase Document

101.LAB			XBRL Taxonomy Extension Label Linkbase Document

101.PRE			XBRL Taxonomy Extension Presentation Linkbase Document

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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: August 8, 2017	WESCO AIRCRAFT HOLDINGS, INC.

	By:	/s/ Todd S. Renehan
		Name: Todd S. Renehan
		Title: Chief Executive Officer
		(Principal Executive Officer)

Date: August 8, 2017	By:	/s/ Richard J. Weller
		Name: Richard J. Weller
		Title: Executive Vice President and Chief Financial Officer
		(Principal Financial Officer)

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Jun. 30, 2017	Aug. 01, 2017
Document and Entity Information
Entity Registrant Name	Wesco Aircraft Holdings, Inc
Entity Central Index Key	0001378718
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--09-30
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		99,579,363
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Statement of Financial Position [Abstract]
Accounts receivable, allowance for doubtful accounts (in dollars)	$ 3,240	$ 3,846
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	50,000,000	50,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	950,000,000	950,000,000
Common stock, shares issued (in shares)	99,579,363	98,614,908
Common stock, shares outstanding (in shares)	99,579,363	98,614,908

Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies	Basis of Presentation and Significant Accounting Policies The accompanying unaudited consolidated financial statements include the accounts of Wesco Aircraft Holdings, Inc. and its wholly owned subsidiaries (referred to herein as “Wesco” or the “Company”) prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and with the instructions to Form 10-Q and Article 10 of Regulation S-X. The financial statements presented herein have not been audited by an independent registered public accounting firm, but include all material adjustments (consisting of normal recurring adjustments) which are, in the opinion of management, necessary for fair statement of the financial position, results of operations and cash flows for the period. However, these results are not necessarily indicative of results for any other interim period or for the full fiscal year. The preparation of financial statements in conformity with GAAP requires us to make certain estimates and assumptions for the reporting periods covered by the financial statements. These estimates and assumptions affect the reported amounts of assets, liabilities, revenues and expenses and the disclosure of contingent liabilities. Actual amounts could differ from these estimates. Certain information and footnote disclosures normally included in financial statements in accordance with GAAP have been omitted pursuant to the rules of the Securities and Exchange Commission (“SEC”). The accompanying consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Annual Report on Form 10-K filed with the SEC on November 28, 2016, as amended by Amendment No. 1 to Annual Report on Form 10-K/A filed with the SEC on December 14, 2016 (collectively, the “2016 Form 10-K”). Certain reclassifications have been made to the amounts in prior periods in order to conform to the current period’s presentation. Deferred Financing Costs Debt issuance costs incurred in connection with the issuance of our long-term debt are capitalized and amortized to interest expense over the term of the debt using the straight-line method, which approximates the effective interest method. The unamortized amount is presented as a reduction of long-term debt on the balance sheet. Debt issuance costs incurred in connection with our revolving line-of-credit (LOC) agreement are capitalized and amortized to interest expense over the term of the LOC agreement using the straight-line method. The unamortized amount is presented as a non-current asset on the balance sheet.

Recent Accounting Pronouncements	9 Months Ended
Recent Accounting Pronouncements	Jun. 30, 2017
Accounting Policies [Abstract]
Recent Accounting Pronouncements	Recent Accounting Pronouncements Changes to GAAP are established by the Financial Accounting Standards Board (“FASB”) in the form of Accounting Standards Updates (“ASUs”) to the FASB’s Accounting Standards Codification (“ASC”). We consider the applicability and impact of all ASUs. ASUs not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position and results of operations. New Accounting Standards Issued In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment, which simplifies the current requirements for testing goodwill for impairment by eliminating the second step of the two-step impairment test to measure the amount of an impairment loss. ASU 2017-04 is effective for the Company in fiscal year 2021, including interim reporting periods within that reporting period, and all annual and interim reporting periods thereafter. Early adoption is permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323), Simplifying the Transition to the Equity Method of Accounting. ASU 2016-07 eliminates the requirement that when an investment subsequently qualifies for use of the equity method as a result of an increase in level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. ASU 2016-07 requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and to adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. In addition, ASU 2016-07 requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. ASU 2016-07 is effective for the Company in fiscal year 2018, with early adoption permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from current GAAP. ASU 2016-02 retains a distinction between finance leases (i.e. capital leases under current GAAP) and operating leases. The classification criteria for distinguishing between finance leases and operating leases will be substantially similar to the classification criteria for distinguishing between capital leases and operating leases under current GAAP. ASU 2016-02 also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. A modified retrospective transition approach shall be used when adopting ASU 2016-02, which includes a number of optional practical expedients that entities may elect to apply. ASU 2016-02 is effective for the Company in fiscal year 2020 and interim periods therein, with early application permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements. As of September 30, 2016, total future minimum payments under our operating leases amounted to $57.8 million. In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which affects the accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements of financial instruments. ASU 2016-01 is effective for the Company in fiscal year 2019, with early adoption permitted for certain provisions. We are currently evaluating the impact of ASU 2016-01 related to equity investments and the presentation and disclosure requirements of financial instruments on our consolidated financial statements. In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory, which requires an entity to measure inventory at the lower of cost and net realizable value, and eliminates current GAAP options for measuring market value. ASU 2015-11 defines realizable value as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. ASU 2015-11 is effective for the Company in fiscal year 2018, and interim periods therein. Early adoption is permitted for financial statements that have not been previously issued. ASU 2015-11 can only be applied prospectively. We do not anticipate the adoption of ASU 2015-11 will have a significant impact on our consolidated financial statements. In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which amends ASC Subtopic 205-40 to provide guidance about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related disclosures. Specifically, ASU 2014-15 (1) provides a definition of the term “substantial doubt,” (2) requires an evaluation every reporting period, (3) provides principles for considering the mitigating effect of management’s plans, (4) requires certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) requires an express statement and other disclosures when substantial doubt is not alleviated, and (6) requires an assessment for a period of one year after the date that financial statements are issued. ASU 2014-15 is effective for the Company in fiscal year 2017, and for annual periods and interim periods thereafter. We do not anticipate the adoption of ASU 2014-15 will have a significant impact on our consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is amended by ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-11, ASU 2016-12, ASU 2016-20 and ASU 2017-10, which FASB issued in August 2015, March 2016, April 2016, May 2016, May 2016, December 2016 and May 2017, respectively (collectively the “amended ASU 2014-09”). The amended ASU 2014-09 provides a single comprehensive model for the recognition of revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. It requires an entity to recognize revenue when the entity transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amended ASU 2014-09 creates a five-step model that requires entities to exercise judgment when considering the terms of contract(s), which includes (1) identifying the contract(s) with the customer, (2) identifying the separate performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the separate performance obligations, and (5) recognizing revenue as each performance obligation is satisfied. The amended ASU 2014-09 requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The effective date for the amended ASU 2014-09 for the Company is fiscal year 2019, including interim reporting periods within that reporting period. Early adoption is permitted for fiscal year 2018, including interim reporting periods within that reporting period. The amended ASU 2014-09 may have an impact on the timing and amount of revenues and cost of sales in our industry due primarily to changes in whether certain performance obligations are accounted for on a gross or net basis, separating service revenue from the related product revenue, reporting costs currently included in operating expense as costs of services, and capitalizing certain up-front costs related to contracts and amortizing them over the service period. We have begun reviewing our largest contracts to determine the extent to which these and other issues may impact on our results after adoption. We plan to adopt the amended ASU 2014-09 in fiscal 2019 using the modified retrospective method. Adopted Accounting Standards Effective October 1, 2016, we elected to early adopt ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The primary impacts of adoption are (1) the recognition of excess tax benefits in our benefit (provision) for income taxes instead of paid-in capital and (2) the presentation of excess tax benefits in the statement of cash flows as cash provided by operating activities instead of cash provided by financing activities. The first requirement is required to be applied prospectively. For the nine months ended June 30, 2017, we recorded $1.2 million of excess tax benefits as a reduction to our provision for income tax. For the second requirement, we elected to adopt this update prospectively. For the nine months ended June 30, 2017, we included the $1.2 million excess tax benefits in cash provided by operating activities on our consolidated statements of cash flows. ASU 2016-09 also addresses cash flow statement presentation. Since we have historically presented cash flows related to employee taxes paid for withheld shares as a financing activity, ASU 2016-09 had no impact on our consolidated statements of cash flows. As permitted by ASU 2019-09, we have elected to continue to estimate forfeitures to determine the amount of compensation cost to be recognized in each period. Effective October 1, 2016, we adopted, on a prospective basis, ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments, which requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. As of June 30, 2017, we did not have any provisional amounts outstanding from prior acquisitions. Therefore, the adoption of ASU 2015-16 did not have any impact on our consolidated financial statements. Effective October 1, 2016, we adopted ASU 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements. ASU 2015-15 states entities should present debt issuance costs as an asset, and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. As of June 30, 2017 and September 30, 2016, we had $3.9 million and $1.1 million, respectively, of deferred financing costs related to our revolving line-of-credit facility. Effective October 1, 2016, we adopted ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Cost. ASU 2015-03 requires that we change the presentation of debt issuance costs on our consolidated balance sheets. Effective October 1, 2016, our unamortized debt financing costs are presented as a reduction of long-term debt instead of being presented as an asset on our consolidated balance sheet. As required by ASU 2015-03, we reclassified $7.6 million of deferred debt financing costs from non-current assets to reduce our $841.9 million long-term debt as of September 30, 2016. As of June 30, 2017, deferred debt financing costs of $12.5 million are presented as a reduction of our long-term debt. See Note 6 for further information. Effective October 1, 2016, we adopted, on a prospective basis, ASU 2014-12, Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments when the Terms of an Award Provide that a Performance Target Could Be Achieved After the Requisite Service Period. ASU 2014-12 requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The adoption of ASU 2014-12 did not have any impact on our consolidated financial statements.

Inventory	9 Months Ended
Inventory	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventory	Inventory Our inventory is comprised solely of finished goods. During the three months ended June 30, 2017 and 2016, we recorded a charge to cost of sales of $3.8 million and $3.2 million, respectively, to write down excess inventory to its net realizable value. During the nine months ended June 30, 2017 and 2016, we recorded a charge to cost of sales of $9.1 million and $9.6 million, respectively, to write down excess inventory to its net realizable value.



Dated:	August 8, 2017

/s/ Todd S. Renehan
Name: Todd S. Renehan
Title: Chief Executive Officer
(Principal Executive Officer)

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Current assets
Cash and cash equivalents	$ 57,056	$ 77,061
Accounts receivable, net of allowance for doubtful accounts of $3,240 and $3,846 at June 30, 2017 and September 30, 2016, respectively	264,023	249,195
Inventories	802,709	713,470
Prepaid expenses and other current assets	12,865	10,203
Income taxes receivable	1,387	1,460
Total current assets	1,138,040	1,051,389
Property and equipment, net	51,172	50,525
Deferred line-of-credit financing costs, net	3,906	1,120
Goodwill	266,644	579,865
Intangible assets, net	182,045	194,114
Deferred tax assets	119,293	58,171
Other assets	12,566	13,394
Total assets	1,773,666	1,948,578
Current liabilities
Accounts payable	175,834	181,700
Accrued expenses and other current liabilities	33,882	26,424
Income taxes payable	0	6,782
Capital lease obligations-current portion	2,922	1,471
Short-term borrowings and current portion of long-term debt	68,000	0
Total current liabilities	280,638	216,377
Capital lease obligations, less current portion	2,298	1,710
Long-term debt, less current portion	793,061	834,279
Deferred tax liabilities	4,092	4,092
Other liabilities	5,767	9,205
Total liabilities	1,085,856	1,065,663
Commitments and contingencies
Stockholders’ equity
Preferred stock, $0.001 par value per share: 50,000,000 shares authorized; no shares issued and outstanding	0	0
Common stock, $0.001 par value, 950,000,000 shares authorized, 99,579,363 and 98,614,908 shares issued and outstanding at June 30, 2017 and September 30, 2016, respectively	100	99
Additional paid-in capital	436,020	427,295
Accumulated other comprehensive loss	(84,283)	(79,561)
Retained earnings	335,973	535,082
Total stockholders’ equity	687,810	882,915
Total liabilities and stockholders’ equity	$ 1,773,666	$ 1,948,578

Consolidated Statements of Earnings and Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Net sales	$ 363,907	$ 375,186	$ 1,067,877	$ 1,111,771
Cost of sales	273,699	275,945	793,457	813,564
Gross profit	90,208	99,241	274,420	298,207
Selling, general and administrative expenses	66,313	59,197	192,071	179,708
Goodwill impairment	311,114	0	311,114	0
(Loss) income from operations	(287,219)	40,044	(228,765)	118,499
Interest expense, net	(9,614)	(9,325)	(29,529)	(27,436)
Other income, net	256	2,657	289	3,960
(Loss) income before provision for income taxes	(296,577)	33,376	(258,005)	95,023
Benefit (provision) for income taxes	66,969	(9,360)	58,946	(26,906)
Net (loss) income	(229,608)	24,016	(199,059)	68,117
Other comprehensive income (loss), net	960	(21,936)	(4,722)	(36,128)
Comprehensive (loss) income	$ (228,648)	$ 2,080	$ (203,781)	$ 31,989
Net (loss) income per share:
Basic (in dollars per share)	$ (2.32)	$ 0.25	$ (2.02)	$ 0.70
Diluted (in dollars per share)	$ (2.32)	$ 0.24	$ (2.02)	$ 0.69
Weighted average shares outstanding:
Basic (in shares)	98,869,675	97,929,438	98,558,330	97,511,590
Diluted (in shares)	98,869,675	98,599,215	98,558,330	98,108,904

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Cash flows from operating activities
Net (loss) income	$ (199,059)	$ 68,117
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,812	20,843
Amortization of deferred financing costs	5,136	3,144
Bad debt and sales return reserve	(252)	41
Goodwill impairment	311,114	0
Stock-based compensation expense	5,958	6,406
Excess tax benefit related to stock-based incentive plans	0	(796)
Deferred income taxes	(62,231)	4,240
Other non-cash items	528	(4,374)
Changes in assets and liabilities:
Accounts receivable	(15,972)	(10,466)
Inventories	(91,599)	(25,253)
Prepaid expenses and other assets	(1,854)	(352)
Income taxes receivable	86	5
Accounts payable	(5,675)	21,466
Accrued expenses and other liabilities	6,905	(6,098)
Income taxes payable	(6,743)	(10,330)
Net cash (used in) provided by operating activities	(32,846)	66,593
Cash flows from investing activities
Purchase of property and equipment	(6,831)	(11,161)
Proceeds from sales of assets	0	2,000
Net cash used in investing activities	(6,831)	(9,161)
Cash flows from financing activities
Proceeds from short-term borrowings	60,000	0
Repayment of short-term borrowings	(12,000)	0
Repayment of long-term debt	(16,344)	(76,000)
Financing costs	(12,796)	(2,126)
Repayment of capital lease obligations	(1,278)	(1,037)
Excess tax benefit related to stock-based incentive plans	0	796
Proceeds from issuance of common stock	2,965	6,126
Settlement on restricted stock tax withholding	(264)	0
Net cash provided by (used in) financing activities	20,283	(72,241)
Effect of foreign currency exchange rate on cash and cash equivalents	(611)	(2,572)
Net decrease in cash and cash equivalents	(20,005)	(17,381)
Cash and cash equivalents, beginning of period	77,061	82,866
Cash and cash equivalents, end of period	$ 57,056	$ 65,485

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies We are involved in various legal matters that arise in the ordinary course of business. Our management, after consulting with outside legal counsel, believes that the ultimate outcome of such matters will not have a material adverse effect on our business, financial position, results of operations or cash flows. There can be no assurance, however, that such actions will not be material or adversely affect our business, financial position, results of operations or cash flows.

Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of accounting	The accompanying unaudited consolidated financial statements include the accounts of Wesco Aircraft Holdings, Inc. and its wholly owned subsidiaries (referred to herein as “Wesco” or the “Company”) prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and with the instructions to Form 10-Q and Article 10 of Regulation S-X.
Deferred Financing Costs	Debt issuance costs incurred in connection with the issuance of our long-term debt are capitalized and amortized to interest expense over the term of the debt using the straight-line method, which approximates the effective interest method. The unamortized amount is presented as a reduction of long-term debt on the balance sheet. Debt issuance costs incurred in connection with our revolving line-of-credit (LOC) agreement are capitalized and amortized to interest expense over the term of the LOC agreement using the straight-line method. The unamortized amount is presented as a non-current asset on the balance sheet.
New Accounting Standards Issued	In January 2017, the FASB issued ASU 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment, which simplifies the current requirements for testing goodwill for impairment by eliminating the second step of the two-step impairment test to measure the amount of an impairment loss. ASU 2017-04 is effective for the Company in fiscal year 2021, including interim reporting periods within that reporting period, and all annual and interim reporting periods thereafter. Early adoption is permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements. In March 2016, the FASB issued ASU 2016-07, Investments - Equity Method and Joint Ventures (Topic 323), Simplifying the Transition to the Equity Method of Accounting. ASU 2016-07 eliminates the requirement that when an investment subsequently qualifies for use of the equity method as a result of an increase in level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. ASU 2016-07 requires that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor’s previously held interest and to adopt the equity method of accounting as of the date the investment becomes qualified for equity method accounting. In addition, ASU 2016-07 requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. ASU 2016-07 is effective for the Company in fiscal year 2018, with early adoption permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which requires lessees to recognize on the balance sheet a right-of-use asset, representing its right to use the underlying asset for the lease term, and a lease liability for all leases with terms greater than 12 months. The recognition, measurement, and presentation of expenses and cash flows arising from a lease by a lessee have not significantly changed from current GAAP. ASU 2016-02 retains a distinction between finance leases (i.e. capital leases under current GAAP) and operating leases. The classification criteria for distinguishing between finance leases and operating leases will be substantially similar to the classification criteria for distinguishing between capital leases and operating leases under current GAAP. ASU 2016-02 also requires qualitative and quantitative disclosures designed to assess the amount, timing, and uncertainty of cash flows arising from leases. A modified retrospective transition approach shall be used when adopting ASU 2016-02, which includes a number of optional practical expedients that entities may elect to apply. ASU 2016-02 is effective for the Company in fiscal year 2020 and interim periods therein, with early application permitted. We are currently evaluating the impact of this guidance on our consolidated financial statements. As of September 30, 2016, total future minimum payments under our operating leases amounted to $57.8 million. In January 2016, the FASB issued ASU 2016-01, Financial Instruments-Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, which affects the accounting for equity investments, financial liabilities under the fair value option and the presentation and disclosure requirements of financial instruments. ASU 2016-01 is effective for the Company in fiscal year 2019, with early adoption permitted for certain provisions. We are currently evaluating the impact of ASU 2016-01 related to equity investments and the presentation and disclosure requirements of financial instruments on our consolidated financial statements. In July 2015, the FASB issued ASU 2015-11, Inventory (Topic 330): Simplifying the Measurement of Inventory, which requires an entity to measure inventory at the lower of cost and net realizable value, and eliminates current GAAP options for measuring market value. ASU 2015-11 defines realizable value as the estimated selling prices in the ordinary course of business, less reasonably predictable costs of completion, disposal, and transportation. ASU 2015-11 is effective for the Company in fiscal year 2018, and interim periods therein. Early adoption is permitted for financial statements that have not been previously issued. ASU 2015-11 can only be applied prospectively. We do not anticipate the adoption of ASU 2015-11 will have a significant impact on our consolidated financial statements. In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements - Going Concern (Subtopic 205-40): Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern, which amends ASC Subtopic 205-40 to provide guidance about management’s responsibility to evaluate whether there is substantial doubt about an entity’s ability to continue as a going concern and to provide related disclosures. Specifically, ASU 2014-15 (1) provides a definition of the term “substantial doubt,” (2) requires an evaluation every reporting period, (3) provides principles for considering the mitigating effect of management’s plans, (4) requires certain disclosures when substantial doubt is alleviated as a result of consideration of management’s plans, (5) requires an express statement and other disclosures when substantial doubt is not alleviated, and (6) requires an assessment for a period of one year after the date that financial statements are issued. ASU 2014-15 is effective for the Company in fiscal year 2017, and for annual periods and interim periods thereafter. We do not anticipate the adoption of ASU 2014-15 will have a significant impact on our consolidated financial statements. In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606). ASU 2014-09 is amended by ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-11, ASU 2016-12, ASU 2016-20 and ASU 2017-10, which FASB issued in August 2015, March 2016, April 2016, May 2016, May 2016, December 2016 and May 2017, respectively (collectively the “amended ASU 2014-09”). The amended ASU 2014-09 provides a single comprehensive model for the recognition of revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. It requires an entity to recognize revenue when the entity transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The amended ASU 2014-09 creates a five-step model that requires entities to exercise judgment when considering the terms of contract(s), which includes (1) identifying the contract(s) with the customer, (2) identifying the separate performance obligations in the contract, (3) determining the transaction price, (4) allocating the transaction price to the separate performance obligations, and (5) recognizing revenue as each performance obligation is satisfied. The amended ASU 2014-09 requires additional disclosure about the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts, including qualitative and quantitative information about contracts with customers, significant judgments and changes in judgments and assets recognized from costs incurred to obtain or fulfill a contract. The effective date for the amended ASU 2014-09 for the Company is fiscal year 2019, including interim reporting periods within that reporting period. Early adoption is permitted for fiscal year 2018, including interim reporting periods within that reporting period. The amended ASU 2014-09 may have an impact on the timing and amount of revenues and cost of sales in our industry due primarily to changes in whether certain performance obligations are accounted for on a gross or net basis, separating service revenue from the related product revenue, reporting costs currently included in operating expense as costs of services, and capitalizing certain up-front costs related to contracts and amortizing them over the service period. We have begun reviewing our largest contracts to determine the extent to which these and other issues may impact on our results after adoption. We plan to adopt the amended ASU 2014-09 in fiscal 2019 using the modified retrospective method. Adopted Accounting Standards Effective October 1, 2016, we elected to early adopt ASU 2016-09, Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The primary impacts of adoption are (1) the recognition of excess tax benefits in our benefit (provision) for income taxes instead of paid-in capital and (2) the presentation of excess tax benefits in the statement of cash flows as cash provided by operating activities instead of cash provided by financing activities. The first requirement is required to be applied prospectively. For the nine months ended June 30, 2017, we recorded $1.2 million of excess tax benefits as a reduction to our provision for income tax. For the second requirement, we elected to adopt this update prospectively. For the nine months ended June 30, 2017, we included the $1.2 million excess tax benefits in cash provided by operating activities on our consolidated statements of cash flows. ASU 2016-09 also addresses cash flow statement presentation. Since we have historically presented cash flows related to employee taxes paid for withheld shares as a financing activity, ASU 2016-09 had no impact on our consolidated statements of cash flows. As permitted by ASU 2019-09, we have elected to continue to estimate forfeitures to determine the amount of compensation cost to be recognized in each period. Effective October 1, 2016, we adopted, on a prospective basis, ASU 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments, which requires that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. As of June 30, 2017, we did not have any provisional amounts outstanding from prior acquisitions. Therefore, the adoption of ASU 2015-16 did not have any impact on our consolidated financial statements. Effective October 1, 2016, we adopted ASU 2015-15, Interest - Imputation of Interest (Subtopic 835-30): Presentation and Subsequent Measurement of Debt Issuance Costs Associated with Line-of-Credit Arrangements. ASU 2015-15 states entities should present debt issuance costs as an asset, and subsequently amortize the deferred debt issuance costs ratably over the term of the line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. As of June 30, 2017 and September 30, 2016, we had $3.9 million and $1.1 million, respectively, of deferred financing costs related to our revolving line-of-credit facility. Effective October 1, 2016, we adopted ASU 2015-03, Interest - Imputation of Interest (Subtopic 835-30): Simplifying the Presentation of Debt Issuance Cost. ASU 2015-03 requires that we change the presentation of debt issuance costs on our consolidated balance sheets. Effective October 1, 2016, our unamortized debt financing costs are presented as a reduction of long-term debt instead of being presented as an asset on our consolidated balance sheet. As required by ASU 2015-03, we reclassified $7.6 million of deferred debt financing costs from non-current assets to reduce our $841.9 million long-term debt as of September 30, 2016. As of June 30, 2017, deferred debt financing costs of $12.5 million are presented as a reduction of our long-term debt. See Note 6 for further information. Effective October 1, 2016, we adopted, on a prospective basis, ASU 2014-12, Compensation-Stock Compensation (Topic 718): Accounting for Share-Based Payments when the Terms of an Award Provide that a Performance Target Could Be Achieved After the Requisite Service Period. ASU 2014-12 requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. The adoption of ASU 2014-12 did not have any impact on our consolidated financial statements.

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating leases, future minimum payments due		$ 57,800
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, amount	$ 1,200
Deferred financing costs as of June 30, 2017	16,407
Carrying amount		841,900
Other noncurrent assets \| Accounting Standards Update 2015-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred financing costs as of June 30, 2017		(7,600)
Long-term debt \| Accounting Standards Update 2015-03
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred financing costs as of June 30, 2017	(12,500)	7,600
Line of credit \| Accounting Standards Update 2015-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred financing costs as of June 30, 2017	3,900	$ 1,100
New accounting pronouncement, early adoption, effect \| Accounting Standards Update 2016-09, Statutory tax withholding component
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by (used in) operating activities	$ 1,200

Inventory (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
Inventory (Details) - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Inventory Disclosure [Abstract]
Inventory write-down	$ 3.8	$ 3.2	$ 9.1	$ 9.6

Goodwill - Additional Information (Details) $ in Thousands		3 Months Ended		6 Months Ended	9 Months Ended
Goodwill - Additional Information (Details) $ in Thousands	Jul. 01, 2016 reporting_unit	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2017 reporting_unit	Jun. 30, 2017 USD ($) reporting_unit	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Goodwill [Line Items]
Goodwill, period increase (decrease)					$ (313,200)
Goodwill impairment		$ 311,114	$ 0		311,114	$ 0
Goodwill, foreign currency translation gain (loss)		(2,100)			$ (2,107)
Number of reporting units \| reporting_unit	4			2	2
Goodwill		$ 266,644	$ 581,359		$ 266,644	$ 581,359	$ 579,865
North America Hardware [Member]
Goodwill [Line Items]
Goodwill impairment					$ 240,600
Reporting unit, percentage of fair value in excess of carrying amount	29.00%	8.00%			8.00%
Goodwill		$ 51,400			$ 51,400
North America Chemical [Member]
Goodwill [Line Items]
Goodwill impairment					$ 70,500
Reporting unit, percentage of fair value in excess of carrying amount	15.00%	9.00%			9.00%
Goodwill		$ 153,400			$ 153,400
Rest of World Hardware [Member]
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount		105.00%			105.00%
Rest of World Chemical [Member]
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount		22.00%			22.00%

Fair Value of Financial Instruments - Cash Flow Hedges of Interest Rate Risk (Details) - Cash flow hedging	9 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016	Jul. 31, 2015 interest_rate_swap_agreement
Interest rate swap
Derivative [Line Items]
Derivative instrument, gain (loss) reclassification from AOCI to income	$ 2,100,000
Interest rate swap one
Derivative [Line Items]
Derivative, fixed interest rate (as a percent)		1.21%
Interest rate swap two
Derivative [Line Items]
Derivative, fixed interest rate (as a percent)			2.2625%
Designated as hedging instrument \| Interest rate swap
Derivative [Line Items]
Number of interest rate derivatives held \| interest_rate_swap_agreement				2
Designated as hedging instrument \| Interest rate swap one
Derivative [Line Items]
Derivative, notional amount		$ 387,500,000
Designated as hedging instrument \| Interest rate swap two
Derivative [Line Items]
Derivative, notional amount		$ 375,000,000

Fair Value of Financial Instruments - Non-Designated Derivatives (Details)	Jun. 30, 2017 USD ($)	Jan. 06, 2017 foreign_currency_forward_contract	Oct. 05, 2016 foreign_currency_forward_contract	Sep. 30, 2016 USD ($)
Designated as hedging instrument \| Interest rate contract
Derivative [Line Items]
Derivative, notional amount \| $	$ 387,500,000			$ 425,000,000
Other income \| Not designated as hedging instrument \| Foreign exchange contract
Derivative [Line Items]
Number of foreign currency forward contracts \| foreign_currency_forward_contract		1	2

Fair Value of Financial Instruments - Location and Fair Value Amounts of Financial Instruments (Details) - Designated as hedging instrument - Interest rate contract - Cash flow hedging - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Other current assets
Derivative [Line Items]
Derivative asset, fair value, gross asset	$ 83	$ 0
Accrued expenses and other current liabilities
Derivative [Line Items]
Derivative liability, fair value, gross liability	2,069	1,057
Other liabilities
Derivative [Line Items]
Derivative liability, fair value, gross liability	$ 1,482	$ 5,615

Fair Value of Financial Instruments - Changes in AOCI (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period		$ 882,915
Balance at end of period	$ 687,810	687,810
Accumulated net gain (loss) from cash flow hedges attributable to parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(1,756)	(4,206)
Change in fair value of hedging instruments	(513)	1,548
Amounts reclassified to earnings	39	428
Net current period other comprehensive income	(474)	1,976
Balance at end of period	$ (2,230)	$ (2,230)

Fair Value of Financial Instruments - Other Financial Instruments (Details) - Level 2 - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Carrying reported amount fair value disclosure
Fair value of financial instruments
Principal Amount	$ 825,562	$ 841,906
Estimate of fair value measurement
Fair value of financial instruments
Fair Value	809,551	837,060
Term loan due December 2017 \| Carrying reported amount fair value disclosure
Fair value of financial instruments
Principal Amount	385,000	401,344
Term loan due December 2017 \| Estimate of fair value measurement
Fair value of financial instruments
Fair Value	381,728	401,344
Term loan due February 2021 \| Carrying reported amount fair value disclosure
Fair value of financial instruments
Principal Amount	440,562	440,562
Term loan due February 2021 \| Estimate of fair value measurement
Fair value of financial instruments
Fair Value	$ 427,823	$ 435,716

Fair Value of Financial Instruments - Fair Value Measurement (Details) - Designated as hedging instrument - Interest rate contract - Fair value, measurements, recurring - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Other current assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	$ 83
Other current assets \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative asset	83
Accrued expenses and other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	2,069	$ 1,057
Accrued expenses and other current liabilities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	2,069	1,057
Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	1,482	5,615
Other liabilities \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liability	$ 1,482	$ 5,615

Long-Term Debt Long-Term Debt - Additional Information (Details)		3 Months Ended	9 Months Ended
	Oct. 04, 2016 USD ($)	Dec. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017 GBP (£)	Mar. 28, 2017 USD ($)	Mar. 27, 2017 USD ($)	Sep. 30, 2016 USD ($)
Debt Instrument [Line Items]
Carrying amount															$ 841,900,000
Deferred financing costs															8,745,000
Write off of deferred debt issuance cost	$ 2,322,000
Fifth Amendment And Restatement Of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	2,336,000		$ 2,300,000
Amendment and Restatement of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	10,462,000		$ 10,500,000
Debt instrument, net debt to EBITDA ratio			4.29									4.29
Existing Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs			$ 3,400,000
Write off of deferred debt issuance cost		$ 2,300,000
Maximum \| Amendment and Restatement of Credit Agreement
Debt Instrument [Line Items]
Covenant terms net, debt to EBITDA ratio			4.50									4.50
Term loan due December 2017
Debt Instrument [Line Items]
Principal amount			$ 400,000,000.0
Quarterly payments of debt			15,000,000
Voluntary prepayment of debt			$ 1,300,000
Debt instrument, quarterly periodic payment principal percentage, year one (as a percent)			1.25%									1.25%
Interest rate at end of period (as a percent)			4.23%									4.23%
Deferred financing costs															2,247,000
Write off of deferred debt issuance cost	1,769,000
Term loan due December 2017 \| Fifth Amendment And Restatement Of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	1,617,000		$ 1,600,000
Term loan due December 2017 \| Amendment and Restatement of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	7,215,000		$ 7,200,000
Term loan due December 2017 \| Maximum \| Eurocurrency
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			3.00%
Term loan due December 2017 \| Maximum \| Alternate base rate
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			2.00%
Term loan due December 2017 \| Minimum \| Eurocurrency
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			2.00%
Term loan due December 2017 \| Minimum \| Alternate base rate
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			1.00%
Revolving credit facility
Debt Instrument [Line Items]
Revolving line of credit			$ 180,000,000.0
Voluntary prepayment of debt			12,000,000
Carrying amount			48,000,000
Debt instrument, unused borrowing capacity			132,000,000
Debt instrument, unused borrowing capacity, covenant compliance			$ 39,300,000.0
Interest rate at end of period (as a percent)			4.13%									4.13%
Debt instrument, term			90 days
Deferred financing costs															1,120,000
Write off of deferred debt issuance cost	553,000
Revolving credit facility \| Fifth Amendment And Restatement Of Credit Agreement
Debt Instrument [Line Items]
Principal amount, Capped Incremental Facility													$ 75,000,000	$ 150,000,000
Covenant terms net, debt to EBITDA ratio			3.50									3.50
Deferred financing costs	719,000		$ 700,000
Revolving credit facility \| Amendment and Restatement of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	3,247,000		$ 3,300,000
Revolving credit facility \| Maximum \| Eurocurrency
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			3.00%
Revolving credit facility \| Maximum \| Alternate base rate
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			2.00%
Revolving credit facility \| Maximum \| Fifth Amendment And Restatement Of Credit Agreement
Debt Instrument [Line Items]
Covenant terms net, debt to EBITDA ratio			4.50									4.50
Revolving credit facility \| Maximum \| Fifth Amendment And Restatement Of Credit Agreement \| Eurocurrency
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			3.00%
Revolving credit facility \| Maximum \| Fifth Amendment And Restatement Of Credit Agreement \| Alternate base rate
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			2.00%
Revolving credit facility \| Minimum \| Eurocurrency
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			2.00%
Revolving credit facility \| Minimum \| Alternate base rate
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			1.00%
Revolving credit facility \| Minimum \| Fifth Amendment And Restatement Of Credit Agreement \| Eurocurrency
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			2.75%
Revolving credit facility \| Minimum \| Fifth Amendment And Restatement Of Credit Agreement \| Alternate base rate
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			1.75%
Term loan due February 2021
Debt Instrument [Line Items]
Principal amount			$ 525,000,000.0
Interest rate at end of period (as a percent)			3.80%									3.80%
Debt instrument, quarterly periodic payment principal percentage (as a percent)			0.25%									0.25%
Deferred financing costs															$ 5,378,000
Write off of deferred debt issuance cost	0
Term loan due February 2021 \| Eurocurrency
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			2.50%
Term loan due February 2021 \| Alternate base rate
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			1.50%
Term loan due February 2021 \| Fifth Amendment And Restatement Of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	0
Term loan due February 2021 \| Amendment and Restatement of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	$ 0
Term loan due February 2021 \| Minimum \| Eurocurrency
Debt Instrument [Line Items]
Debt instrument, variable interest rate (as a percent)			0.75%
Term loan due February 2021 \| Minimum \| Alternate base rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate (as a percent)			1.75%
Foreign line of credit \| Wesco Aircraft Europe Limited
Debt Instrument [Line Items]
Revolving line of credit			$ 9,100,000									£ 7,000,000.0
Line of credit facility, current borrowing capacity \| £												£ 7,000,000
Foreign line of credit \| Base rate \| Wesco Aircraft Europe Limited
Debt Instrument [Line Items]
Applicable margin rate (as a percent)			1.65%
Scenario, forecast \| Revolving credit facility \| Maximum \| Fifth Amendment And Restatement Of Credit Agreement
Debt Instrument [Line Items]
Convenant terms, net debt to EBITDA ratio, period one											4.50
Covenant terms, net debt to EBITDA ratio, period two										4.25
Covenant terms, net debt to EBITDA ratio, period three											4.25
Covenant terms, net debt to EBITDA ratio, period four								4.00
Covenant terms, net debt to EBITDA ratio, period five									4.0
Covenant terms, net debt to EBITDA ratio, period six						3.75
Covenant terms, net debt to EBITDA ratio, period seven							3.75
Debt Instrument Net Debt to EBITDA Ratio, period eight				3.50
Covenant terms, net debt to EBITDA ratio, thereafter					3.50

Long-Term Debt - Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Deferred Financing Costs	$ (12,501)	$ (7,627)
Carrying Amount		841,900
Less: current portion	(20,000)	0
Long-term debt, less current portion, gross	805,562	841,906
Long-term debt, less current portion, net	793,061	834,279
Term loan due December 2017 \| Term loan
Debt Instrument [Line Items]
Principal Amount	385,000	401,344
Deferred Financing Costs	(8,035)	(2,247)
Carrying Amount	376,965	399,097
Term loan due February 2021 \| Term loan
Debt Instrument [Line Items]
Principal Amount	440,562	440,562
Deferred Financing Costs	(4,466)	(5,380)
Carrying Amount	$ 436,096	$ 435,182

Long-Term Debt - Deferred Financing Costs (Details) - USD ($) $ in Thousands	Oct. 04, 2016	Jun. 30, 2017	Sep. 30, 2016
Debt Instrument [Line Items]
Deferred financing costs			$ 8,745
Write off of deferred debt issuance cost	$ (2,322)
Amortization of deferred financing costs		$ (2,814)
Deferred financing costs as of June 30, 2017		16,407
Term loan due December 2017
Debt Instrument [Line Items]
Deferred financing costs			2,247
Write off of deferred debt issuance cost	(1,769)
Amortization of deferred financing costs		(1,275)
Deferred financing costs as of June 30, 2017		8,035
Term loan due February 2021
Debt Instrument [Line Items]
Deferred financing costs			5,378
Write off of deferred debt issuance cost	0
Amortization of deferred financing costs		(912)
Deferred financing costs as of June 30, 2017		4,466
Revolving credit facility
Debt Instrument [Line Items]
Deferred financing costs			$ 1,120
Write off of deferred debt issuance cost	(553)
Amortization of deferred financing costs		(627)
Deferred financing costs as of June 30, 2017		3,906
Amendment and Restatement of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	10,462	10,500
Amendment and Restatement of Credit Agreement \| Term loan due December 2017
Debt Instrument [Line Items]
Deferred financing costs	7,215	7,200
Amendment and Restatement of Credit Agreement \| Term loan due February 2021
Debt Instrument [Line Items]
Deferred financing costs	0
Amendment and Restatement of Credit Agreement \| Revolving credit facility
Debt Instrument [Line Items]
Deferred financing costs	3,247	3,300
Fifth Amendment And Restatement Of Credit Agreement
Debt Instrument [Line Items]
Deferred financing costs	2,336	2,300
Fifth Amendment And Restatement Of Credit Agreement \| Term loan due December 2017
Debt Instrument [Line Items]
Deferred financing costs	1,617	1,600
Fifth Amendment And Restatement Of Credit Agreement \| Term loan due February 2021
Debt Instrument [Line Items]
Deferred financing costs	0
Fifth Amendment And Restatement Of Credit Agreement \| Revolving credit facility
Debt Instrument [Line Items]
Deferred financing costs	$ 719	$ 700

Segment Reporting (Details) $ in Thousands	3 Months Ended		9 Months Ended
Segment Reporting (Details) $ in Thousands	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) reportable_segment	Jun. 30, 2016 USD ($)	Sep. 30, 2016 USD ($)
Segment Reporting [Line Items]
Number of reportable segments \| reportable_segment			2
Net sales	$ 363,907	$ 375,186	$ 1,067,877	$ 1,111,771
(Loss) income from operations	(287,219)	40,044	(228,765)	118,499
Interest expense, net	(9,614)	(9,325)	(29,529)	(27,436)
Benefit (provision) for income taxes	66,969	(9,360)	58,946	(26,906)
Capital expenditures	2,622	3,928	6,831	11,161
Depreciation and amortization	7,340	6,790	20,812	20,843
Total assets	1,773,666	1,990,887	1,773,666	1,990,887	$ 1,948,578
Goodwill	266,644	581,359	266,644	581,359	$ 579,865
North America
Segment Reporting [Line Items]
Net sales	292,993	300,875	858,568	889,816
(Loss) income from operations	(293,489)	29,267	(253,211)	86,380
Interest expense, net	(8,688)	(8,233)	(26,890)	(24,073)
Benefit (provision) for income taxes	68,525	(6,868)	64,361	(19,897)
Capital expenditures	1,064	3,878	4,475	10,616
Depreciation and amortization	6,451	5,769	18,332	17,771
Total assets	1,482,067	1,700,979	1,482,067	1,700,979
Goodwill	204,762	515,876	204,762	515,876
Rest of World
Segment Reporting [Line Items]
Net sales	70,914	74,311	209,309	221,955
(Loss) income from operations	6,270	10,777	24,446	32,119
Interest expense, net	(926)	(1,092)	(2,639)	(3,363)
Benefit (provision) for income taxes	(1,556)	(2,492)	(5,415)	(7,009)
Capital expenditures	1,558	50	2,356	545
Depreciation and amortization	889	1,021	2,480	3,072
Total assets	291,599	289,908	291,599	289,908
Goodwill	$ 61,882	$ 65,483	$ 61,882	$ 65,483

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Benefit (provision) for income taxes	$ 66,969	$ (9,360)	$ 58,946	$ (26,906)
Effective tax rate	22.60%	28.00%	22.80%	28.30%
Effective income tax rate reconciliation, share-based compensation, excess tax benefit, percent	(10.00%)		5.50%
Goodwill impairment	$ 311,114	$ 0	$ 311,114	$ 0
Pro Forma
Effective tax rate	27.30%		22.60%
Foreign tax credit
Deferred tax asset, valuation allowance	$ 10,600		$ 10,600