Goodwill and Other Intangible Assets - Changes in carrying amount of goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Goodwill and Other Intangible Assets
Beginning Balance	$ 504,853	$ 408,100
Acquisition activity	1,000	97,400
Foreign currency translation and other	(13,200)	(600)
Ending Balance	492,709	504,853
USG
Goodwill and Other Intangible Assets
Beginning Balance	366,500	271,900
Acquisition activity	(4,700)	95,200
Foreign currency translation and other	(13,100)	(600)
Ending Balance	348,700	366,500
Test
Goodwill and Other Intangible Assets
Beginning Balance	34,100	34,100
Foreign currency translation and other	(100)
Ending Balance	34,000	34,100
A&D
Goodwill and Other Intangible Assets
Beginning Balance	104,300	102,100
Acquisition activity	5,700	2,200
Ending Balance	$ 110,000	$ 104,300