BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 779,617	$ 574,682	$ 1,371,366	$ 1,116,205
United States
Disaggregation of Revenue [Line Items]
Revenue	617,556	436,323	1,077,031	856,296
Europe
Disaggregation of Revenue [Line Items]
Revenue	46,790	39,006	65,157	52,162
Canada
Disaggregation of Revenue [Line Items]
Revenue	44,906	31,575	79,548	65,178
Australia
Disaggregation of Revenue [Line Items]
Revenue	62,189	63,691	136,537	133,231
All other countries
Disaggregation of Revenue [Line Items]
Revenue	8,176	4,087	13,093	9,338
Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Revenue	411,012	331,871	694,185	622,913
Consumer and Professional Products | United States
Disaggregation of Revenue [Line Items]
Revenue	264,747	205,368	429,646	388,810
Consumer and Professional Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	46,783	38,965	65,113	52,121
Consumer and Professional Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	31,029	21,778	53,657	43,893
Consumer and Professional Products | Australia
Disaggregation of Revenue [Line Items]
Revenue	62,189	63,691	136,537	133,231
Consumer and Professional Products | All other countries
Disaggregation of Revenue [Line Items]
Revenue	6,264	2,069	9,232	4,858
Consumer and Professional Products | Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	50,478	50,560	89,237	96,160
Consumer and Professional Products | Retail
Disaggregation of Revenue [Line Items]
Revenue	216,836	153,746	347,071	292,994
Consumer and Professional Products | Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	12,019	14,540	22,346	28,055
Consumer and Professional Products | Industrial
Disaggregation of Revenue [Line Items]
Revenue	21,068	9,958	32,374	19,489
Consumer and Professional Products | International excluding North America
Disaggregation of Revenue [Line Items]
Revenue	110,611	103,067	203,157	186,215
Home and Building Products
Disaggregation of Revenue [Line Items]
Revenue	368,605	242,811	677,181	493,292
Home and Building Products | United States
Disaggregation of Revenue [Line Items]
Revenue	352,809	230,955	647,385	467,486
Home and Building Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	7	41	44	41
Home and Building Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	13,877	9,797	25,891	21,285
Home and Building Products | Australia
Disaggregation of Revenue [Line Items]
Revenue	0	0	0	0
Home and Building Products | All other countries
Disaggregation of Revenue [Line Items]
Revenue	1,912	2,018	3,861	4,480
Home and Building Products | Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	172,377	120,827	317,462	246,942
Home and Building Products | Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	38,852	27,233	71,554	55,660
Home and Building Products | Commercial construction
Disaggregation of Revenue [Line Items]
Revenue	$ 157,376	$ 94,751	$ 288,165	$ 190,690