BUSINESS SEGMENTS - Segment EBITDA (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Adjusted EBITDA	$ 138,613		$ 134,815	$ 384,049	$ 333,325
Segment adjusted EBITDA	152,595		148,220	426,437	373,049
Depreciation and amortization	(15,669)		(17,688)	(50,036)	(47,021)
Debt extinguishment, net	0		(5,287)	0	(5,287)
Gain on sale of building	0		0	10,852	0
Intangible asset impairment	0	$ (100,000)	0	(100,000)	0
Fair value step-up of acquired inventory sold				0	(5,401)
Income before taxes from continuing operations	78,453		76,050	56,314	182,765
Operating Segments
Segment Reporting Information [Line Items]
Depreciation and amortization	(15,529)		(17,550)	(49,616)	(46,609)
Operating Segments | Home and Building Products
Segment Reporting Information [Line Items]
Adjusted EBITDA	134,330		119,847	390,346	280,618
Depreciation and amortization	(3,868)		(4,116)	(11,525)	(12,778)
Operating Segments | Consumer and Professional Products
Segment Reporting Information [Line Items]
Adjusted EBITDA	18,265		28,373	36,091	92,431
Depreciation and amortization	(11,661)		(13,434)	(38,091)	(33,831)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Unallocated amounts, excluding depreciation	(13,982)		(13,405)	(42,388)	(39,724)
Net interest expense	(25,207)		(23,961)	(74,394)	(60,985)
Depreciation and amortization	(15,669)		(17,688)	(50,036)	(47,021)
Debt extinguishment, net	0		(5,287)	0	(5,287)
Gain on sale of building	0		0	10,852	0
Strategic review - retention and other	5,812		3,220	20,234	3,220
Proxy expenses	(568)		0	(2,685)	(6,952)
Acquisition costs	0		0	0	(9,303)
Restructuring charges	(3,862)		(5,909)	(82,196)	(12,391)
Intangible asset impairment	0		0	(100,000)	0
Special dividend ESOP charges	(9,042)		0	(9,042)	0
Fair value step-up of acquired inventory sold	$ 0		$ (2,700)	$ 0	$ (5,401)