BUSINESS SEGMENTS - Segment EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 139,568	$ 65,379	$ 199,122	$ 133,832
Segment adjusted EBITDA	152,318	77,483	224,829	158,565
Depreciation and amortization	(16,252)	(13,149)	(29,333)	(25,739)
Fair value step-up of acquired inventory sold			(2,701)	0
Income before taxes from continuing operations	83,104	29,201	107,327	66,339
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	(16,115)	(12,999)	(29,059)	(25,539)
Operating Segments | Consumer and Professional Products
Segment Reporting Information [Line Items]
Adjusted EBITDA	47,844	37,423	64,058	70,136
Depreciation and amortization	(11,791)	(8,620)	(20,397)	(16,819)
Operating Segments | Home and Building Products
Segment Reporting Information [Line Items]
Adjusted EBITDA	104,474	40,060	160,771	88,429
Depreciation and amortization	(4,324)	(4,379)	(8,662)	(8,720)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Unallocated amounts, excluding depreciation	(12,750)	(12,104)	(25,707)	(24,733)
Net interest expense	(21,376)	(15,527)	(37,024)	(31,173)
Depreciation and amortization	(16,252)	(13,149)	(29,333)	(25,739)
Restructuring charges	(4,766)	(7,502)	(6,482)	(10,581)
Acquisition costs	(6,708)	0	(9,303)	0
Proxy expenses	(4,661)	0	(6,952)	0
Fair value step-up of acquired inventory sold	$ (2,701)	$ 0	$ (2,701)	$ 0