BUSINESS SEGMENTS - Summary of Segment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Oct. 01, 2018	Sep. 30, 2018
Segment assets:
Continuing Assets	$ 2,108,241		$ 2,081,650
Assets of discontinued operations	3,218		3,240
Total Assets	2,111,459	$ 2,085,933	2,084,890
Home And Building Products [Member]
Segment assets:
Continuing Assets	1,691,211		1,631,631
Telephonics [Member]
Segment assets:
Continuing Assets	328,241		346,907
Operating Segments [Member]
Segment assets:
Continuing Assets	2,019,452		1,978,538
Corporate, Non-Segment [Member]
Segment assets:
Continuing Assets	$ 88,789		$ 103,112