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Segment Information (Summary of Consolidated Net Sales and Segment Operating Profit by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]      
Net sales $ 3,567,064 $ 3,324,249 $ 2,914,566
Cost of goods sold 2,610,772 2,447,770 2,236,983
Selling, general and administrative expenses 329,823 307,499 269,692
Research and development costs 147,568 140,676 132,095
Aerospace [Member]      
Segment Reporting Information [Line Items]      
Net sales 2,312,806 2,028,618 1,768,103
Industrial [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,254,258 1,295,631 1,146,463
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 3,567,064 3,324,249 2,914,566
Cost of goods sold 2,601,734 2,441,192 2,218,024
Selling, general and administrative expenses 194,341 185,861 166,547
Research and development costs 141,152 134,897 125,121
Other segment items [1] (59,300) (52,918) (46,852)
Reportable segment operating profit 689,137 615,217 451,726
Operating Segments [Member] | Aerospace [Member]      
Segment Reporting Information [Line Items]      
Net sales 2,312,806 2,028,618 1,768,103
Cost of goods sold 1,687,214 1,517,239 1,362,124
Selling, general and administrative expenses 87,136 85,103 78,910
Research and development costs 87,302 90,138 80,825
Other segment items [1] (55,459) (49,222) (43,860)
Reportable segment operating profit 506,613 385,360 290,104
Operating Segments [Member] | Industrial [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,254,258 1,295,631 1,146,463
Cost of goods sold 914,520 923,953 855,900
Selling, general and administrative expenses 107,205 100,758 87,637
Research and development costs 53,850 44,759 44,296
Other segment items [1] (3,841) (3,696) (2,992)
Reportable segment operating profit $ 182,524 $ 229,857 $ 161,622
[1] Other segment items mainly includes our equity interest in the earnings of the JV, other components of net periodic pension and other postretirement benefit, excluding service cost and interest expense, and net gain/loss on sales of assets and businesses.