BUSINESS SEGMENTS - Summary of Segment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Oct. 01, 2018	Sep. 30, 2018
Segment assets:
Continuing Assets	$ 2,140,683		$ 2,081,650
Assets of discontinued operations	3,225		3,240
Total Assets	2,143,908	$ 2,085,933	2,084,890
Home And Building Products [Member]
Segment assets:
Continuing Assets	1,729,199		1,631,631
Telephonics [Member]
Segment assets:
Continuing Assets	325,179		346,907
Operating Segments [Member]
Segment assets:
Continuing Assets	2,054,378		1,978,538
Corporate, Non-Segment [Member]
Segment assets:
Continuing Assets	$ 86,305		$ 103,112