REPORTABLE SEGMENTS (Details) - Schedule of disaggregated revenue by segment - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 660,673	$ 632,061	$ 566,350	$ 548,438	$ 574,164	$ 574,970	$ 549,633	$ 510,522	$ 2,407,522	$ 2,209,289	$ 1,977,918
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue									1,139,233	1,000,608	953,612
Home and Building Products (HBP)
Segment Reporting Information [Line Items]
Revenue									927,313	873,640	697,969
Defense Electronics
Segment Reporting Information [Line Items]
Revenue									340,976	335,041	$ 326,337
Residential Repair and Remodel | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue									173,859	140,369
Residential Repair and Remodel | Home and Building Products (HBP)
Segment Reporting Information [Line Items]
Revenue									467,112	439,287
Retail | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue									575,947	528,279
Residential New Construction | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue									59,907	58,709
Residential New Construction | Home and Building Products (HBP)
Segment Reporting Information [Line Items]
Revenue									105,285	99,014
Industrial | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue									40,285	45,129
International Excluding North America | Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue									289,235	228,122
Commercial Construction | Home and Building Products (HBP)
Segment Reporting Information [Line Items]
Revenue									354,916	335,339
United States Government | Defense Electronics
Segment Reporting Information [Line Items]
Revenue									222,537	211,405
International | Defense Electronics
Segment Reporting Information [Line Items]
Revenue									100,623	105,705
Commercial | Defense Electronics
Segment Reporting Information [Line Items]
Revenue									$ 17,816	$ 17,931