DISCONTINUED OPERATIONS - Balance Sheets Information of Discontinued Operations (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Sep. 30, 2021
CURRENT ASSETS
Prepaid and other current assets	$ 487	$ 605
ASSETS OF DISCONTINUED OPERATIONS	2,623	3,424
Total assets of discontinued operations	3,110	4,029
CURRENT LIABILITIES
Total liabilities of discontinued operations	34,631	7,074
Discontinued Operations, Held-for-sale
CURRENT ASSETS
Total assets of discontinued operations	$ 0	275,814
Defense Electronics | Discontinued Operations, Held-for-sale
CURRENT ASSETS
Accounts receivable, net		42,020
Contract assets, net of progress payments		72,983
Inventories		83,970
Prepaid and other current assets		4,409
PROPERTY, PLANT AND EQUIPMENT, net		47,771
OPERATING LEASE RIGHT-OF-USE ASSETS		1,167
GOODWILL		17,734
INTANGIBLE ASSETS, net		131
ASSETS OF DISCONTINUED OPERATIONS		5,629
Total assets of discontinued operations		275,814
CURRENT LIABILITIES
Accounts payable		60,588
Accrued liabilities		15,326
Current portion of operating lease liabilities		287
LONG-TERM OPERATING LEASE LIABILITIES		867
OTHER LIABILITIES		3,955
Total liabilities of discontinued operations		$ 81,023