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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | $ 581,321 | $ 720,220 | $ 1,118,940 | $ 1,440,575
Aerospace [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 364,706 | 474,236 | 686,373 | 948,161
Aerospace [Member] | Commercial OEM [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 101,907 | 144,610 | 177,988 | 303,276
Aerospace [Member] | Commercial Aftermarket [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 77,579 | 134,042 | 143,094 | 259,970
Aerospace [Member] | Defense OEM [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 135,630 | 139,901 | 266,893 | 280,827
Aerospace [Member] | Defense Aftermarket [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 49,590 | 55,683 | 98,398 | 104,088
Industrial [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 216,615 | 245,984 | 432,567 | 492,414
Industrial [Member] | Reciprocating Engines [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | 163,034 | 163,555 | 327,956 | 338,208
Industrial [Member] | Industrial Turbines [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales |  | $ 53,581 | 59,678 | $ 104,611 | 111,177
Industrial [Member] | Renewables [Member] |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Total net sales | [1] |  | $ 22,751 |  | $ 43,029
[1] | Sales in the renewables market were discontinued as of May 1, 2020 following the closing of the divestiture of the renewable power systems business and other related businesses (as described more fully in Note 10, Sale of businesses, and defined therein as the “disposal group”).

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