DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations before taxes	$ 0	$ 113,457	$ 0	$ 117,777
Provision for income taxes	$ 0	25,952	$ 0	20,149
Defense Electronics | Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue		50,795		161,061
Cost of goods and services		39,059		125,208
Gross profit		11,736		35,853
Selling, general and administrative expenses		6,114		26,423
Income from discontinued operations		5,622		9,430
Interest income, net		0		2
Gain on sale of business		108,949		108,949
Other, net		(1,114)		(604)
Total other income (expense)		107,835		108,347
Income from discontinued operations before taxes		113,457		117,777
Provision for income taxes		25,952		20,149
Income from discontinued operations		$ 87,505		$ 97,628