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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 758,844 | $ 548,249 | $ 1,411,655 | $ 1,018,397
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 405,327 |  | 741,964 |
Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 88,793 |  | 164,906 |
Europe, excluding Germany [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 113,913 |  | 212,873 |
Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 108,755 |  | 212,179 |
Other Countries [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 42,056 |  | 79,733 |
Aerospace [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 482,954 |  | 875,841 |
Aerospace [Member] | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 351,763 |  | 638,508 |
Aerospace [Member] | Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 25,068 |  | 37,817 |
Aerospace [Member] | Europe, excluding Germany [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 48,782 |  | 88,394 |
Aerospace [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 23,292 |  | 47,298 |
Aerospace [Member] | Other Countries [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 34,049 |  | 63,824 |
Aerospace [Member] | Commercial OEM [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 174,343 |  | 314,851 |
Aerospace [Member] | Commercial Aftermarket [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 139,708 |  | 251,056 |
Aerospace [Member] | Defense OEM [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 123,006 |  | 224,842 |
Aerospace [Member] | Defense Aftermarket [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 45,897 |  | 85,092 |
Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 275,890 |  | 535,814 |
Industrial [Member] | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 53,564 |  | 103,456 |
Industrial [Member] | Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 63,725 |  | 127,089 |
Industrial [Member] | Europe, excluding Germany [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 65,131 |  | 124,479 |
Industrial [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 85,463 |  | 164,881 |
Industrial [Member] | Other Countries [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 8,007 |  | 15,909 |
Industrial [Member] | Reciprocating Engines [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 209,257 |  | 405,387 |
Industrial [Member] | Industrial Turbines [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 52,187 |  | 101,699 |
Industrial [Member] | Renewables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 14,446 |  | $ 28,728 |

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