v3.26.1
Segment Information (Summary of Consolidated Total Assets, Capital Expenditures, Depreciation and Amortization by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2025
Segment Reporting Information [Line Items]          
Consolidated total assets $ 5,196,401   $ 5,196,401   $ 4,630,143
Property, plant and equipment, net 1,087,764   1,087,764   986,623
Depreciation and amortization 32,069 $ 28,654 91,013 $ 84,096  
Capital expenditures     156,337 78,537  
Unallocated Corporate [Member]          
Segment Reporting Information [Line Items]          
Property, plant and equipment, net 129,115   129,115   120,502
Other assets 1,030,134   1,030,134   897,333
Depreciation and amortization 3,490 2,980 10,228 8,966  
Capital expenditures     12,485 24,563  
Aerospace [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Consolidated total assets 2,529,518   2,529,518   2,110,805
Depreciation and amortization 15,742 13,198 42,039 38,539  
Capital expenditures     115,069 32,188  
Industrial [Member] | Operating Segments [Member]          
Segment Reporting Information [Line Items]          
Consolidated total assets 1,507,634   1,507,634   $ 1,501,503
Depreciation and amortization $ 12,837 $ 12,476 38,746 36,591  
Capital expenditures     $ 28,783 $ 21,786