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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | $ 2,245,832 | $ 2,495,665 | $ 2,900,197
United States [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 1,278,123 | 1,426,454 | 1,628,064
Germany [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 183,696 | 233,965 | 302,084
Europe, excluding Germany [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 291,941 | 336,971 | 431,416
China [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 214,269 | 209,885 | 214,829
Asia, excluding China [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 137,500 | 140,069 | 164,488
Other Countries [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 140,303 | 148,321 | 159,316
Aerospace [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 1,404,117 | 1,590,963 | 1,880,520
Aerospace [Member] | United States [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 1,103,373 | 1,231,004 | 1,415,880
Aerospace [Member] | Germany [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 31,005 | 52,635 | 72,907
Aerospace [Member] | Europe, excluding Germany [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 95,984 | 122,938 | 178,905
Aerospace [Member] | China [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 35,286 | 38,359 | 47,492
Aerospace [Member] | Asia, excluding China [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 23,363 | 27,068 | 37,991
Aerospace [Member] | Other Countries [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 115,106 | 118,959 | 127,345
Aerospace [Member] | Commercial OEM [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 386,543 | 434,306 | 659,336
Aerospace [Member] | Commercial Aftermarket [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 306,547 | 399,843 | 497,795
Aerospace [Member] | Defense OEM [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 509,815 | 526,264 | 529,940
Aerospace [Member] | Defense Aftermarket [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 201,212 | 230,550 | 193,449
Industrial [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 841,715 | 904,702 | 1,019,677
Industrial [Member] | United States [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 174,750 | 195,450 | 212,184
Industrial [Member] | Germany [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 152,691 | 181,330 | 229,177
Industrial [Member] | Europe, excluding Germany [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 195,957 | 214,033 | 252,511
Industrial [Member] | China [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 178,983 | 171,526 | 167,337
Industrial [Member] | Asia, excluding China [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 114,137 | 113,001 | 126,497
Industrial [Member] | Other Countries [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 25,197 | 29,362 | 31,971
Industrial [Member] | Reciprocating Engines [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | 639,946 | 632,555 | 751,136
Industrial [Member] | Industrial Turbines [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales |  | $ 201,769 | 222,366 | 210,064
Industrial [Member] | Renewables [Member] |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |
Total net sales | [1] |  | $ 49,781 | $ 58,477
[1] | Sales in the renewables market were discontinued as of May 1, 2020 following the closing of the divestiture of the disposal group (see Note 10, Sale of businesses).

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