DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ / shares in Units, $ in Thousands, $ in Thousands					1 Months Ended	12 Months Ended
	Dec. 22, 2020 USD ($)	Aug. 21, 2020 USD ($) shares	Aug. 21, 2020 USD ($) shares	Aug. 18, 2020 USD ($) shares	Aug. 31, 2020 USD ($) shares	Sep. 30, 2021 USD ($) unit segment $ / shares	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) unit $ / shares	Sep. 30, 2019 USD ($)	Sep. 30, 2021 AUD ($)	Nov. 12, 2020 USD ($)	Sep. 30, 2020 AUD ($)	Sep. 30, 2020 CAD ($)	Jan. 30, 2020 USD ($)	Jan. 29, 2020 USD ($)	Nov. 30, 2019 USD ($)	Oct. 01, 2019 USD ($)	Sep. 30, 2018 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Sale of stock, number of shares issued (in shares) | shares		700,000	8,700,000	8,000,000	8,700,000
Net process from sale of stock		$ 14,335,000	$ 178,165,000	$ 163,830,000	$ 178,165,000
Number of reportable segments | segment						2
Cash in non U.S. bank accounts						$ 65,000,000		$ 55,000,000
Fair value of insurance contracts						3,973,000
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax						6,433,000		5,601,000
Defined benefit plan, fair value of plan assets						160,523,000		147,145,000
Change in retained earnings						807,158,000		700,151,000	$ 477,763,000									$ 474,391,000
Customer program reserves and cash discounts netted against accounts receivable						49,833,000		44,439,000
Depreciation, depletion and amortization, nonproduction						42,741,000		42,614,000	42,124,000
Accumulated capitalized interest costs						1,592,000		$ 2,098,000	2,410,000
Original cost of fully depreciated property plant and equipment						$ 261,101,000
Number of reporting units | unit						2		3
Fair value projection, term						5 years
Fair value terminal value (in percentage)						3.00%
Operating right-of-use assets						$ 144,598,000		$ 154,349,000
Lease liabilities						149,196,000		160,260,000
Goodwill, impairment loss						0		0	0
Research and development arrangement, contract to perform for others, costs incurred, gross						7,000,000		8,000,000	8,000,000
Shipping and handling cost						113,700,000		100,135,000	93,700,000
Selling, general and administrative expenses						470,530,000		444,454,000	408,339,000
Non-service cost components of net periodic benefit cost (credit)						(907,000)		(1,559,000)	(3,148,000)
One Time Charges | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost																$ 65,000,000
One Time Charges | Next-generation Business Platform | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost											$ 65,000,000
Capital Investments | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost																65,000,000
Capital Investments | Next-generation Business Platform | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost											65,000,000
Employee Severance and Facility Closing | Next-generation Business Platform | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost											46,000,000
Personnel Related Costs | Next-generation Business Platform | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost											26,000,000
Facilities, Exit Costs and Other | Next-generation Business Platform | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost											20,000,000
Asset Write-Downs | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost																$ 19,000,000
Asset Write-Downs | Next-generation Business Platform | Consumer and Professional Products
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Restructuring and related cost											$ 19,000,000
Quatro Design Pty Ltd
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Business combination, expected annual revenue from acquiree	$ 5,000,000
Selling, General and Administrative Expenses
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Depreciation						$ 14,362,000		13,944,000	13,314,000
Home Depot
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Percentage of consolidated accounts receivable						19.00%
Fair Value, Inputs, Level 2 | Estimate of Fair Value Measurement
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Trading securities						$ 16,044,000		1,703,000
Fair Value, Inputs, Level 2 | Portion at other than Fair Value Measurement
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Trading securities						15,050,000		$ 1,000,000
Senior Notes Due 2028
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Debt instrument, face amount							$ 1,000,000,000
Stated percentage							5.75%
Senior Notes Due 2028 | Fair Value, Inputs, Level 1
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Long-term debt, fair value						$ 1,060,000,000
Senior Notes Due 2022
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Stated percentage							5.25%
Extinguishment of debt, amount							$ 1,000,000,000
Minimum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Fair value discount rates (in percentage)						7.10%
Finite-lived intangible asset, useful life						8 years
Minimum | Building and Building Improvements
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life						25 years
Minimum | Machinery and equipment
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life						2 years
Maximum
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Maturity period of highly liquid investments						3 months
Fair value discount rates (in percentage)						9.00%
Finite-lived intangible asset, useful life						25 years
Maximum | Building and Building Improvements
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life						40 years
Maximum | Machinery and equipment
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life						15 years
Australian Dollar Contracts | Designated as hedging instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Derivative, notional amount										$ 20,000		$ 32,000
Contracts weighted average rate price (in dollars per share) | $ / shares						$ 1.27		$ 1.41
Accumulated other comprehensive income (loss), foreign currency translation adjustment, before tax						$ 1,710,000		$ 168,000
Accumulated other comprehensive income (loss), foreign currency translation adjustment, net of tax						1,197,000		109,000
Gain (loss) on hedging activity						$ (2,204,000)		$ (2,163,000)
Australian Dollar Contracts | Minimum | Designated as hedging instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Contracts expiration days						29 days
Australian Dollar Contracts | Maximum | Designated as hedging instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Contracts expiration days						90 days
Canadian Dollar Contract | Not Designated as Hedging Instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Derivative, notional amount						$ 4,600,000							$ 7,900
Contracts weighted average rate price (in dollars per share) | $ / shares						$ 1.26		$ 1.32
Fair value gain (loss) on foreign currency contract not qualify for hedge accounting						$ 38,000		$ (92,000)
Canadian Dollar Contract | Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument | Other Income
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Gain (loss) on sale of derivatives						$ (381,000)		189,000
Canadian Dollar Contract | Minimum | Not Designated as Hedging Instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Term of contract						30 days
Canadian Dollar Contract | Maximum | Not Designated as Hedging Instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Term of contract						360 days
Great Britain Pound Contracts | Not Designated as Hedging Instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Derivative, notional amount						$ 0		5,400,000
Fair value gain (loss) on foreign currency contract not qualify for hedge accounting						30,000		39,000
Great Britain Pound Contracts | Fair Value, Inputs, Level 2 | Not Designated as Hedging Instrument | Other Income
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Gain (loss) on sale of derivatives						494,000		$ 0
Great Britain Pound Contracts | Maximum | Not Designated as Hedging Instrument
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Contracts weighted average rate price (in dollars per share) | $ / shares								$ 0.77
Foreign currency translation adjustments
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Change in retained earnings						(19,250,000)		$ (25,683,000)
Shipping and Handling
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Selling, general and administrative expenses						58,100,000		54,500,000	53,500,000
Advertising
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Selling, general and administrative expenses						$ 19,000,000		$ 18,000,000	$ 18,000,000
Cumulative Effect, Period of Adoption, Adjustment
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Change in retained earnings																		$ (5,618,000)
Operating right-of-use assets																	$ 163,552,000
Lease liabilities																	$ 163,676,000
Revolver Due 2025
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Maximum borrowing capacity														$ 400,000,000	$ 350,000,000