REPORTABLE SEGMENTS - Schedule of disaggregated revenue by geographic region (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
United States
Segment Reporting Information [Line Items]
Revenue	2,296,041	1,753,075	1,646,215
United States | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	858,956	766,150	769,100
United States | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	1,437,085	986,925	877,115
Europe
Segment Reporting Information [Line Items]
Revenue	106,531	123,679	85,469
Europe | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	106,471	123,607	85,339
Europe | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	60	72	130
Canada
Segment Reporting Information [Line Items]
Revenue	150,846	130,337	112,734
Canada | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	92,930	85,676	74,072
Canada | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	57,916	44,661	38,662
Australia
Segment Reporting Information [Line Items]
Revenue	258,945	244,674	203,012
Australia | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	258,945	244,674	203,012
Australia | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	0	0	0
Total Revenue
Segment Reporting Information [Line Items]
Revenue	36,125	18,861	19,116
Total Revenue | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	24,304	9,411	7,710
Total Revenue | Home and Building Products
Segment Reporting Information [Line Items]
Revenue	$ 11,821	$ 9,450	$ 11,406