BUSINESS SEGMENTS - Revenues (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	3
Revenue	$ 609,291	$ 548,438
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	291,042	241,076
Home and Building Products
Segment Reporting Information [Line Items]
Revenue	250,481	241,381
Defense Electronics
Segment Reporting Information [Line Items]
Revenue	$ 67,768	$ 65,981