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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 752,005 | $ 588,117 | $ 2,163,660 | $ 1,606,514
United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 439,516 |  | 1,181,480 |
Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 69,262 |  | 234,168 |
Europe, excluding Germany [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 109,785 |  | 322,658 |
Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 92,764 |  | 304,943 |
Other Countries [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 40,678 |  | 120,411 |
Aerospace [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 498,775 |  | 1,374,616 |
Aerospace [Member] | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 386,136 |  | 1,024,644 |
Aerospace [Member] | Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 18,319 |  | 56,136 |
Aerospace [Member] | Europe, excluding Germany [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 42,849 |  | 131,243 |
Aerospace [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 18,908 |  | 66,206 |
Aerospace [Member] | Other Countries [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 32,563 |  | 96,387 |
Aerospace [Member] | Commercial OEM [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 174,077 |  | 488,928 |
Aerospace [Member] | Commercial Aftermarket [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 124,863 |  | 375,919 |
Aerospace [Member] | Defense OEM [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 147,696 |  | 372,538 |
Aerospace [Member] | Defense Aftermarket [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 52,139 |  | 137,231 |
Industrial [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 253,230 |  | 789,044 |
Industrial [Member] | United States |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 53,380 |  | 156,836 |
Industrial [Member] | Germany |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 50,943 |  | 178,032 |
Industrial [Member] | Europe, excluding Germany [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 66,936 |  | 191,415 |
Industrial [Member] | Asia [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 73,856 |  | 238,737 |
Industrial [Member] | Other Countries [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 8,115 |  | 24,024 |
Industrial [Member] | Reciprocating Engines [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 185,523 |  | 590,910 |
Industrial [Member] | Industrial Turbines [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | 53,740 |  | 155,439 |
Industrial [Member] | Renewables [Member] |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total net sales | $ 13,967 |  | $ 42,695 |

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