REPORTABLE SEGMENTS - Schedule of disaggregated revenue by segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenue	$ 2,685,183	$ 2,848,488	$ 2,270,626
Home and Building Products
Segment Reporting Information [Line Items]
Revenue	1,588,505	1,506,882	1,041,108
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	1,096,678	1,341,606	1,229,518
Residential repair and remodel | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	757,088	736,525	516,995
Residential repair and remodel | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	377,775	392,490	185,896
Commercial | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	700,112	630,066	407,585
Retail | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	267,046	456,735	577,839
Residential new construction | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	131,305	140,291	116,528
Residential new construction | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	51,093	45,243	50,437
Industrial | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	78,308	76,430	43,411
International excluding North America | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	$ 322,456	$ 370,708	$ 371,935