DISCONTINUED OPERATIONS - Income Statement Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disposal Group, Including Discontinued Operations [Line Items]
Income (loss) from operations of discontinued operations	$ (6,937)	$ 6,559	$ (30,464)	$ 35,159
Provision for income taxes	7,742	18,043	3,019	27,971
Defense Electronics | Discontinued Operations, Held-for-sale
Disposal Group, Including Discontinued Operations [Line Items]
Revenue	145,956	163,936	547,133	537,915
Cost of goods and services	102,047	117,530	398,620	384,756
Gross profit	43,909	46,406	148,513	153,159
Selling, general and administrative expenses	47,396	40,354	153,660	129,075
Income (loss) from discontinued operations	(3,487)	6,052	(5,147)	24,084
Gain on sale of real estate	0	122	0	8,279
Interest income, net	357	410	507	1,063
Other, net	148	(25)	779	1,733
Total other income (expense)	505	507	1,286	11,075
Income (loss) from discontinued operations before loss on sale of business	(2,982)	6,559	(3,861)	35,159
Loss on sale of business	(3,955)	0	(26,603)	0
Income (loss) from operations of discontinued operations	(6,937)	6,559	(30,464)	35,159
Provision for income taxes	7,742	18,043	3,019	27,971
Income (loss) from discontinued operations	$ (14,679)	$ (11,484)	$ (33,483)	$ 7,188