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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | $ 720,220 | $ 758,844 | $ 1,440,575 | $ 1,411,655
United States [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 409,016 | 405,327 | 824,021 | 741,964
Germany [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 74,052 | 88,793 | 142,768 | 164,906
Europe, excluding Germany [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 106,002 | 113,913 | 195,490 | 212,873
China |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 49,035 | 63,399 | 113,122 | 129,287
Asia, excluding China [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 40,250 | 45,356 | 79,143 | 82,892
Other Countries [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 41,865 | 42,056 | 86,031 | 79,733
Aerospace [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 474,236 | 482,954 | 948,161 | 875,841
Aerospace [Member] | United States [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 356,109 | 351,763 | 720,021 | 638,508
Aerospace [Member] | Germany [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 21,111 | 25,068 | 38,389 | 37,817
Aerospace [Member] | Europe, excluding Germany [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 40,600 | 48,782 | 79,587 | 88,394
Aerospace [Member] | China |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 11,487 | 9,502 | 21,698 | 25,140
Aerospace [Member] | Asia, excluding China [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 10,582 | 13,790 | 17,563 | 22,158
Aerospace [Member] | Other Countries [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 34,347 | 34,049 | 70,903 | 63,824
Aerospace [Member] | Commercial OEM [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 144,610 | 174,343 | 303,276 | 314,851
Aerospace [Member] | Commercial Aftermarket [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 134,042 | 139,708 | 259,970 | 251,056
Aerospace [Member] | Defense OEM [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 139,901 | 123,006 | 280,827 | 224,842
Aerospace [Member] | Defense Aftermarket [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 55,683 | 45,897 | 104,088 | 85,092
Industrial [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 245,984 | 275,890 | 492,414 | 535,814
Industrial [Member] | United States [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 52,907 | 53,564 | 104,000 | 103,456
Industrial [Member] | Germany [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 52,941 | 63,725 | 104,379 | 127,089
Industrial [Member] | Europe, excluding Germany [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 65,402 | 65,131 | 115,903 | 124,479
Industrial [Member] | China |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 37,548 | 53,897 | 91,424 | 104,147
Industrial [Member] | Asia, excluding China [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 29,668 | 31,566 | 61,580 | 60,734
Industrial [Member] | Other Countries [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 7,518 | 8,007 | 15,128 | 15,909
Industrial [Member] | Reciprocating Engines [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 163,555 | 209,257 | 338,208 | 405,387
Industrial [Member] | Industrial Turbines [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 59,678 | 52,187 | 111,177 | 101,699
Industrial [Member] | Renewables [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total net sales | [1] | $ 22,751 | $ 14,446 | $ 43,029 | $ 28,728
[1] | Sales in the renewables market will be discontinued as of May 1, 2020 following the closing of the divestiture of the disposal groups (see Note 10, Impairment of assets held for sale).

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