DISCONTINUED OPERATIONS - Balance Sheets Information of Discontinued Operations (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
CURRENT ASSETS
Prepaid and other current assets	$ 497	$ 605
ASSETS OF DISCONTINUED OPERATIONS	3,194	3,424
Total assets of discontinued operations	3,691	4,029
CURRENT LIABILITIES
Total liabilities of discontinued operations	7,718	7,074
Discontinued Operations, Held-for-sale
CURRENT ASSETS
Total assets of discontinued operations	264,861	273,414
Defense Electronics | Discontinued Operations, Held-for-sale
CURRENT ASSETS
Accounts receivable, net	48,652	42,020
Contract assets, net of progress payments	52,497	72,983
Inventories	87,265	83,970
Prepaid and other current assets	4,993	4,409
PROPERTY, PLANT AND EQUIPMENT, net	47,313	45,371
OPERATING LEASE RIGHT-OF-USE ASSETS	1,167	1,167
GOODWILL	17,734	17,734
INTANGIBLE ASSETS, net	131	131
ASSETS OF DISCONTINUED OPERATIONS	5,109	5,629
Total assets of discontinued operations	264,861	273,414
CURRENT LIABILITIES
Accounts payable	58,681	60,486
Accrued liabilities	10,510	15,153
Current portion of operating lease liabilities	223	287
LONG-TERM OPERATING LEASE LIABILITIES	766	867
OTHER LIABILITIES	3,038	3,955
Total liabilities of discontinued operations	$ 73,218	$ 80,748