v3.26.1
Intangible Assets, Net (Schedule of Finite-Lived and Indefinite-Lived Intangible Assets by Major Class) (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization of Finite-Lived Intangible $ (477,546) $ (458,740)
Net Carrying Amount - Finite-Lived Intangible 380,991  
Intangible Assets, Gross, Total 924,809 886,820
Intangible Assets, Net, Total 447,263 428,080
Customer Relationships And Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 684,326 683,461
Accumulated Amortization of Finite-Lived Intangible (392,789) (377,018)
Net Carrying Amount - Finite-Lived Intangible 291,537 306,443
Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 15,032 3,139
Accumulated Amortization of Finite-Lived Intangible (3,288) (3,139)
Net Carrying Amount - Finite-Lived Intangible 11,744  
Process Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 159,179 132,210
Accumulated Amortization of Finite-Lived Intangible (81,469) (78,583)
Net Carrying Amount - Finite-Lived Intangible 77,710 53,627
Trade Name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 66,272 68,010
Intangible Assets, Net, Total 66,272 68,010
Aerospace [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization of Finite-Lived Intangible (297,006) (292,082)
Intangible Assets, Gross, Total 373,846 326,253
Intangible Assets, Net, Total 76,840 34,171
Aerospace [Member] | Customer Relationships And Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 292,483 281,683
Accumulated Amortization of Finite-Lived Intangible (255,007) (251,109)
Net Carrying Amount - Finite-Lived Intangible 37,476 30,574
Aerospace [Member] | Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 11,893  
Accumulated Amortization of Finite-Lived Intangible (149)  
Net Carrying Amount - Finite-Lived Intangible 11,744  
Aerospace [Member] | Process Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 69,470 44,570
Accumulated Amortization of Finite-Lived Intangible (41,850) (40,973)
Net Carrying Amount - Finite-Lived Intangible 27,620 3,597
Industrial [Member]    
Finite-Lived Intangible Assets [Line Items]    
Accumulated Amortization of Finite-Lived Intangible (180,540) (166,658)
Intangible Assets, Gross, Total 550,963 560,567
Intangible Assets, Net, Total 370,423 393,909
Industrial [Member] | Customer Relationships And Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 391,843 401,778
Accumulated Amortization of Finite-Lived Intangible (137,782) (125,909)
Net Carrying Amount - Finite-Lived Intangible 254,061 275,869
Industrial [Member] | Intellectual Property [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 3,139 3,139
Accumulated Amortization of Finite-Lived Intangible (3,139) (3,139)
Industrial [Member] | Process Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value - Finite-Lived Intangible 89,709 87,640
Accumulated Amortization of Finite-Lived Intangible (39,619) (37,610)
Net Carrying Amount - Finite-Lived Intangible 50,090 50,030
Industrial [Member] | Trade Name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Indefinite-Lived Intangible Assets 66,272 68,010
Intangible Assets, Net, Total $ 66,272 $ 68,010