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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |
Total net sales | $ 720,355 | $ 652,811
United States [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 415,004 | 336,637
Germany [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 68,716 | 76,113
Europe, excluding Germany [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 89,488 | 98,960
China |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 64,088 | 65,889
Asia, excluding China [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 38,893 | 37,535
Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 44,166 | 37,677
Aerospace [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 473,925 | 392,887
Aerospace [Member] | United States [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 363,912 | 286,745
Aerospace [Member] | Germany [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 17,278 | 12,749
Aerospace [Member] | Europe, excluding Germany [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 38,987 | 39,612
Aerospace [Member] | China |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 10,212 | 15,638
Aerospace [Member] | Asia, excluding China [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 6,981 | 8,368
Aerospace [Member] | Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 36,555 | 29,775
Aerospace [Member] | Commercial OEM [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 158,666 | 140,508
Aerospace [Member] | Commercial Aftermarket [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 125,928 | 111,348
Aerospace [Member] | Defense OEM [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 140,926 | 101,836
Aerospace [Member] | Defense Aftermarket [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 48,405 | 39,195
Industrial [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 246,430 | 259,924
Industrial [Member] | United States [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 51,092 | 49,892
Industrial [Member] | Germany [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 51,438 | 63,364
Industrial [Member] | Europe, excluding Germany [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 50,501 | 59,348
Industrial [Member] | China |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 53,876 | 50,251
Industrial [Member] | Asia, excluding China [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 31,912 | 29,167
Industrial [Member] | Other Countries [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 7,611 | 7,902
Industrial [Member] | Reciprocating Engines [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 174,653 | 196,130
Industrial [Member] | Industrial Turbines [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | 51,500 | 49,512
Industrial [Member] | Renewables [Member] |  |
Disaggregation of Revenue [Line Items] |  |
Total net sales | $ 20,277 | $ 14,282

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