REPORTABLE SEGMENTS - Schedule of disaggregated revenue by segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Segment Reporting Information [Line Items]
Revenue	$ 2,848,488	$ 2,270,626	$ 2,066,546
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	1,341,606	1,229,518	1,139,233
Home and Building Products
Segment Reporting Information [Line Items]
Revenue	1,506,882	1,041,108	927,313
Residential Repair and Remodel | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	392,490	185,896	173,859
Residential Repair and Remodel | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	736,525	516,995	467,112
Retail | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	456,735	577,839	575,947
Residential New Construction | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	45,243	50,437	59,907
Residential New Construction | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	140,291	116,528	105,285
Industrial | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	76,430	43,411	40,285
International Excluding North America | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	370,708	371,935	289,235
Commercial Construction | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	$ 630,066	$ 407,585	$ 354,916