DISCONTINUED OPERATIONS - Balance Sheets Information of Discontinued Operations (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
CURRENT ASSETS
Prepaid and other current assets	$ 583	$ 605
ASSETS OF DISCONTINUED OPERATIONS	3,375	3,424
Total assets of discontinued operations	3,958	4,029
CURRENT LIABILITIES
Total liabilities of discontinued operations	6,835	7,074
Discontinued Operations, Held-for-sale
CURRENT ASSETS
Total assets of discontinued operations	261,514	273,414
Defense Electronics | Discontinued Operations, Held-for-sale
CURRENT ASSETS
Accounts receivable, net	32,642	42,020
Contract assets, net of progress payments	69,043	72,983
Inventories	84,796	83,970
Prepaid and other current assets	4,363	4,409
PROPERTY, PLANT AND EQUIPMENT, net	46,205	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	5,433	5,629
Total assets of discontinued operations	261,514	273,414
CURRENT LIABILITIES
Accounts payable	55,661	60,486
Accrued liabilities	15,547	15,153
Current portion of operating lease liabilities	221	287
LONG-TERM OPERATING LEASE LIABILITIES	817	867
OTHER LIABILITIES	2,010	3,955
Total liabilities of discontinued operations	$ 74,256	$ 80,748