BUSINESS SEGMENTS - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 548,438	$ 510,522
United States
Disaggregation of Revenue [Line Items]
Revenue	433,251	401,038
Europe
Disaggregation of Revenue [Line Items]
Revenue	12,613	18,193
Canada
Disaggregation of Revenue [Line Items]
Revenue	31,608	32,975
Australia
Disaggregation of Revenue [Line Items]
Revenue	54,834	44,832
All other countries
Disaggregation of Revenue [Line Items]
Revenue	16,132	13,484
Consumer and Professional Products
Disaggregation of Revenue [Line Items]
Revenue	241,076	216,474
Consumer and Professional Products | United States
Disaggregation of Revenue [Line Items]
Revenue	160,158	142,916
Consumer and Professional Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	6,605	7,865
Consumer and Professional Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	17,781	19,365
Consumer and Professional Products | Australia
Disaggregation of Revenue [Line Items]
Revenue	54,228	44,039
Consumer and Professional Products | All other countries
Disaggregation of Revenue [Line Items]
Revenue	2,304	2,289
Consumer and Professional Products | Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	35,090	27,158
Consumer and Professional Products | Retail
Disaggregation of Revenue [Line Items]
Revenue	119,620	113,365
Consumer and Professional Products | Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	14,973	14,272
Consumer and Professional Products | Industrial
Disaggregation of Revenue [Line Items]
Revenue	10,623	9,758
Consumer and Professional Products | International excluding North America
Disaggregation of Revenue [Line Items]
Revenue	60,770	51,921
Home and Building Products
Disaggregation of Revenue [Line Items]
Revenue	241,381	223,295
Home and Building Products | United States
Disaggregation of Revenue [Line Items]
Revenue	226,950	209,827
Home and Building Products | Europe
Disaggregation of Revenue [Line Items]
Revenue	23	17
Home and Building Products | Canada
Disaggregation of Revenue [Line Items]
Revenue	11,253	10,981
Home and Building Products | Australia
Disaggregation of Revenue [Line Items]
Revenue	0	184
Home and Building Products | All other countries
Disaggregation of Revenue [Line Items]
Revenue	3,155	2,286
Home and Building Products | Residential repair and remodel
Disaggregation of Revenue [Line Items]
Revenue	121,997	113,367
Home and Building Products | Commercial construction
Disaggregation of Revenue [Line Items]
Revenue	91,887	84,376
Home and Building Products | Residential new construction
Disaggregation of Revenue [Line Items]
Revenue	27,497	25,552
Defense Electronics
Disaggregation of Revenue [Line Items]
Revenue	65,981	70,753
Defense Electronics | United States
Disaggregation of Revenue [Line Items]
Revenue	46,143	48,295
Defense Electronics | Europe
Disaggregation of Revenue [Line Items]
Revenue	5,985	10,311
Defense Electronics | Canada
Disaggregation of Revenue [Line Items]
Revenue	2,574	2,629
Defense Electronics | Australia
Disaggregation of Revenue [Line Items]
Revenue	606	609
Defense Electronics | All other countries
Disaggregation of Revenue [Line Items]
Revenue	10,673	8,909
Defense Electronics | U.S. Government
Disaggregation of Revenue [Line Items]
Revenue	42,701	45,560
Defense Electronics | International
Disaggregation of Revenue [Line Items]
Revenue	18,533	22,099
Defense Electronics | Commercial
Disaggregation of Revenue [Line Items]
Revenue	$ 4,747	$ 3,094