BUSINESS SEGMENTS - Revenues (Details) $ in Thousands	3 Months Ended
	Dec. 31, 2021 USD ($) segment	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
Revenue	$ 591,749	$ 541,523
Less: Defense Electronics	(53,993)	(67,768)
Subtotal	645,742	609,291
Discontinued Operations, Held-for-sale | Defense Electronics
Segment Reporting Information [Line Items]
Less: Defense Electronics	(53,993)	(67,768)
Consumer and Professional Products
Segment Reporting Information [Line Items]
Revenue	283,173	291,042
Home and Building Products
Segment Reporting Information [Line Items]
Revenue	$ 308,576	$ 250,481