DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before taxes	$ 0	$ 1,000	$ 0	$ 4,320
Provision (benefit) for income taxes	$ 0	(6,529)	$ 0	(5,803)
Defense Electronics | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		56,273		110,266
Cost of goods and services		45,188		86,149
Gross profit		11,085		24,117
Selling, general and administrative expenses		10,289		20,309
Income from discontinued operations		796		3,808
Interest income, net		2		2
Other, net		202		510
Total other income (expense)		204		512
Income from discontinued operations before taxes		1,000		4,320
Provision (benefit) for income taxes		(6,529)		(5,803)
Income from discontinued operations		$ 7,529		$ 10,123