Acquisitions - Assets Acquired and Liabilities Assumed of S&N (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Tangible assets acquired:
Goodwill	$ 0	$ 17,894	$ 69
L3Harris Technologies, Inc.
Tangible assets acquired:
Accounts receivable	803
Inventory	370
Contract assets	3,920
Operating lease right-of-use assets	1,529
Property, plant, and equipment	1,996
Net pension benefit assets	1,727
Intangible assets acquired	2,740
Goodwill	3,108
Liabilities assumed:
Accounts payable	(1,226)
Accrued expenses	(622)
Contract liabilities	(6,024)
Operating lease liabilities	(1,565)
Asset retirement obligations	(1,895)
Total purchase consideration	$ 4,861