BUSINESS SEGMENTS - Summary of Segment Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Sep. 30, 2019
Segment Reporting Information [Line Items]
Continuing assets	$ 2,254,598	$ 2,071,730
Assets of discontinued operations	3,204	3,209
Total Assets	2,257,802	2,074,939
Operating Segments
Segment Reporting Information [Line Items]
Continuing assets	2,166,000	1,989,301
Operating Segments | Consumer and Professional Products
Segment Reporting Information [Line Items]
Continuing assets	1,235,734	1,070,510
Operating Segments | Home and Building Products
Segment Reporting Information [Line Items]
Continuing assets	589,478	571,216
Operating Segments | Defense Electronics
Segment Reporting Information [Line Items]
Continuing assets	340,788	347,575
Corporate
Segment Reporting Information [Line Items]
Continuing assets	$ 88,598	$ 82,429