DISCONTINUED OPERATIONS - Balance sheets information of discontinued operations (Details) - Discontinued Operations, Held-for-sale - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
CURRENT ASSETS
OTHER ASSETS	$ 0	$ 79,952
Total assets of discontinued operations	273,414	325,678
Defense Electronics
CURRENT ASSETS
Accounts receivable, net	42,020	62,127
Contract assets, net of progress payments	72,983	84,426
Inventories	83,970	93,637
Prepaid and other current assets	4,409	5,536
PROPERTY, PLANT AND EQUIPMENT, net	45,371	46,880
OPERATING LEASE RIGHT-OF-USE ASSETS	1,167	7,278
GOODWILL	17,734	18,545
INTANGIBLE ASSETS, net	131	826
OTHER ASSETS	5,629	6,423
Total assets of discontinued operations	273,414	325,678
CURRENT LIABILITIES
Accounts payable	60,486	59,724
Accrued liabilities	15,153	20,023
Current portion of operating lease liabilities	287	2,176
LONG-TERM OPERATING LEASE LIABILITIES	867	5,466
OTHER LIABILITIES	3,955	4,972
Total liabilities of discontinued operations	$ 80,748	$ 92,361