REPORTABLE SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation of Revenue [Line Items]
Revenue	$ 611,746	$ 672,880	$ 1,244,117	$ 1,316,033
United States
Disaggregation of Revenue [Line Items]
Revenue	498,562	558,468	1,005,643	1,089,268
Europe
Disaggregation of Revenue [Line Items]
Revenue	12,533	18,354	17,073	23,707
Canada
Disaggregation of Revenue [Line Items]
Revenue	28,343	30,776	58,463	66,572
Australia
Disaggregation of Revenue [Line Items]
Revenue	65,240	57,030	148,371	121,901
All other countries
Disaggregation of Revenue [Line Items]
Revenue	7,068	8,252	14,567	14,585
Home and Building Products
Disaggregation of Revenue [Line Items]
Revenue	368,248	392,062	763,649	787,853
Home and Building Products \| United States
Disaggregation of Revenue [Line Items]
Revenue	354,444	375,326	732,702	754,954
Home and Building Products \| Europe
Disaggregation of Revenue [Line Items]
Revenue	0	1	0	109
Home and Building Products \| Canada
Disaggregation of Revenue [Line Items]
Revenue	12,037	14,413	26,153	29,181
Home and Building Products \| Australia
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Home and Building Products \| All other countries
Disaggregation of Revenue [Line Items]
Revenue	1,767	2,322	4,794	3,609
Home and Building Products \| Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	174,312	188,529	368,994	375,070
Home and Building Products \| Commercial
Disaggregation of Revenue [Line Items]
Revenue	162,355	170,740	329,222	347,733
Home and Building Products \| Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	31,581	32,793	65,433	65,050
Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Revenue	243,498	280,818	480,468	528,180
Consumer and Professional Products \| United States
Disaggregation of Revenue [Line Items]
Revenue	144,118	183,142	272,941	334,314
Consumer and Professional Products \| Europe
Disaggregation of Revenue [Line Items]
Revenue	12,533	18,353	17,073	23,598
Consumer and Professional Products \| Canada
Disaggregation of Revenue [Line Items]
Revenue	16,306	16,363	32,310	37,391
Consumer and Professional Products \| Australia
Disaggregation of Revenue [Line Items]
Revenue	65,240	57,030	148,371	121,901
Consumer and Professional Products \| All other countries
Disaggregation of Revenue [Line Items]
Revenue	5,301	5,930	9,773	10,976
Consumer and Professional Products \| Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	78,338	97,044	148,597	173,108
Consumer and Professional Products \| Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	12,498	13,676	26,879	27,681
Consumer and Professional Products \| Retail
Disaggregation of Revenue [Line Items]
Revenue	52,518	73,511	99,781	142,789
Consumer and Professional Products \| Industrial
Disaggregation of Revenue [Line Items]
Revenue	17,562	16,372	31,416	31,149
Consumer and Professional Products \| International excluding North America
Disaggregation of Revenue [Line Items]
Revenue	$ 82,582	$ 80,215	$ 173,795	$ 153,453