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Segment Information (Summary of Consolidated Total Assets, Depreciation and Amortization, and Capital Expenditures by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Consolidated total assets $ 4,630,143 $ 4,368,915 $ 4,010,203
Property, plant and equipment, net 986,623 940,715  
Depreciation and amortization 113,278 116,170 119,743
Capital expenditures 130,928 96,280 76,500
Unallocated Corporate [Member]      
Segment Reporting Information [Line Items]      
Property, plant and equipment, net 120,502 120,946 104,962
Other assets 897,333 801,967 585,490
Depreciation and amortization 12,195 11,086 8,696
Capital expenditures 25,731 (1,639) (2,268)
Aerospace [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Consolidated total assets 2,110,805 1,936,507 1,829,410
Depreciation and amortization 51,603 55,305 59,880
Capital expenditures 62,892 55,989 56,913
Industrial [Member] | Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Consolidated total assets 1,501,503 1,509,495 1,490,341
Depreciation and amortization 49,480 49,779 51,167
Capital expenditures $ 42,305 $ 41,930 $ 21,855