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 [Line Items]
Revenue	$ 1,795,384	$ 1,855,985	$ 1,871,228
Home and Building Products (HBP)
Segment Reporting [Line Items]
Revenue	1,795,384	1,855,985	1,871,228
Residential Repair and Remodel \| Home and Building Products (HBP)
Segment Reporting [Line Items]
Revenue	956,653	1,011,932	1,009,702
Commercial \| Home and Building Products (HBP)
Segment Reporting [Line Items]
Revenue	702,760	709,507	730,221
Residential New Construction \| Home and Building Products (HBP)
Segment Reporting [Line Items]
Revenue	$ 135,971	$ 134,546	$ 131,305

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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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details