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Goodwill and Other Intangible Assets - Carrying amount of goodwill attributable to each business segment from continuing operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Goodwill and Other Intangible Assets    
Beginning Balance $ 529,935 $ 493,200
Acquisition activity 226,500 30,900
Foreign currency translation and other 5,500 5,800
Ending Balance 761,931 529,935
A&D    
Goodwill and Other Intangible Assets    
Beginning Balance 105,600 105,600
Acquisition activity 226,500  
Foreign currency translation and other 1,900  
Ending Balance 334,000 105,600
Test    
Goodwill and Other Intangible Assets    
Beginning Balance 67,400 34,000
Acquisition activity   30,900
Foreign currency translation and other 400 2,500
Ending Balance 67,800 67,400
USG    
Goodwill and Other Intangible Assets    
Beginning Balance 356,900 353,600
Foreign currency translation and other 3,200 3,300
Ending Balance $ 360,100 $ 356,900