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REPORTABLE SEGMENTS - Schedule of Disaggregated Revenue by Segment (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
Residential repair and remodel | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	771,585	769,691	757,088
Residential repair and remodel | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	289,091	352,797	377,775
Commercial | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	676,626	684,388	700,112
Retail | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	170,838	234,591	267,046
Residential new construction | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	135,971	134,546	131,305
Residential new construction | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	55,367	57,537	51,093
Industrial | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	72,352	67,738	78,308
International excluding North America | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	$ 348,096	$ 322,232	$ 322,456

X

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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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