v3.26.1
GOODWILL AND OTHER INTANGIBLE ASSETS - Carrying amount of goodwill attributable to each business segment (Details)
$ in Thousands
 6 Months Ended
Mar. 31, 2026
USD ($)
Goodwill and Other Intangible Assets  
Beginning Balance $ 761,931
Ending Balance 761,181
Operating Segments  
Goodwill and Other Intangible Assets  
Beginning Balance 761,900
Acquisition activity and other 5,100
Foreign currency translation (5,800)
Ending Balance 761,200
A&D | Operating Segments  
Goodwill and Other Intangible Assets  
Beginning Balance 334,000
Acquisition activity and other 5,100
Foreign currency translation (3,300)
Ending Balance 335,800
Test  
Goodwill and Other Intangible Assets  
Beginning Balance 67,800
Foreign currency translation (900)
Ending Balance 66,900
USG | Operating Segments  
Goodwill and Other Intangible Assets  
Beginning Balance 360,100
Foreign currency translation (1,600)
Ending Balance $ 358,500