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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | $ 3,567,064 | $ 3,324,249 | $ 2,914,566
United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 1,914,281 | 1,698,256 | 1,538,075
Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 275,422 | 269,358 | 273,842
Europe, excluding Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 565,588 | 499,938 | 436,979
China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 285,870 | 390,044 | 243,486
Asia, excluding China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 249,205 | 222,706 | 200,029
Other Countries [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 276,698 | 243,947 | 222,155
Aerospace [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 2,312,806 | 2,028,618 | 1,768,103
Aerospace [Member] | United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 1,585,173 | 1,404,223 | 1,254,954
Aerospace [Member] | Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 72,883 | 72,583 | 80,450
Aerospace [Member] | Europe, excluding Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 224,302 | 202,421 | 163,222
Aerospace [Member] | China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 148,192 | 96,136 | 56,773
Aerospace [Member] | Asia, excluding China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 61,965 | 59,103 | 37,107
Aerospace [Member] | Other Countries [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 220,291 | 194,152 | 175,597
Aerospace [Member] | Commercial OEM [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 690,962 | 738,394 | 651,275
Aerospace [Member] | Commercial Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 823,547 | 640,823 | 547,625
Aerospace [Member] | Defense OEM [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 561,288 | 406,810 | 368,653
Aerospace [Member] | Defense Services [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 237,009 | 242,591 | 200,550
Industrial [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 1,254,258 | 1,295,631 | 1,146,463
Industrial [Member] | United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 329,108 | 294,033 | 283,121
Industrial [Member] | Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 202,539 | 196,775 | 193,392
Industrial [Member] | Europe, excluding Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 341,286 | 297,517 | 273,757
Industrial [Member] | China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 137,678 | 293,908 | 186,713
Industrial [Member] | Asia, excluding China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 187,240 | 163,603 | 162,922
Industrial [Member] | Other Countries [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 56,407 | 49,795 | 46,558
Industrial [Member] | Power Generation [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 488,940 | 443,667 | 382,536
Industrial [Member] | Transportation [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | 507,376 | 624,762 | 527,498
Industrial [Member] | Oil and Gas [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | $ 257,942 | $ 227,202 | $ 236,429

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