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REPORTABLE SEGMENTS - Schedule of Disaggregated Revenue by Geographic Region (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 2,519,926	$ 2,623,520	$ 2,685,183
Home and Building Products
Segment Reporting Information [Line Items]
Revenue	1,584,182	1,588,625	1,588,505
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	935,744	1,034,895	1,096,678
United States
Segment Reporting Information [Line Items]
Revenue	2,040,101	2,157,845	2,231,577
United States | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	1,523,828	1,519,063	1,515,479
United States | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	516,273	638,782	716,098
Europe
Segment Reporting Information [Line Items]
Revenue	41,768	53,045	51,059
Europe | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	0	112	18
Europe | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	41,768	52,933	51,041
Canada
Segment Reporting Information [Line Items]
Revenue	112,031	128,370	138,374
Canada | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	49,458	60,995	62,897
Canada | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	62,573	67,375	75,477
Australia
Segment Reporting Information [Line Items]
Revenue	289,018	251,778	231,764
Australia | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	0	0	0
Australia | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	289,018	251,778	231,764
All other countries
Segment Reporting Information [Line Items]
Revenue	37,008	32,482	32,409
All other countries | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	10,896	8,455	10,111
All other countries | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	$ 26,112	$ 24,027	$ 22,298

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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