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Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | $ 537,619 | $ 720,355
United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 300,699 | 415,004
Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 37,148 | 68,716
Europe, excluding Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 64,008 | 89,488
China |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 74,947 | 64,088
Asia, excluding China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 33,115 | 38,893
Other Countries [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 27,702 | 44,166
Aerospace [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 321,667 | 473,925
Aerospace [Member] | United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 257,546 | 363,912
Aerospace [Member] | Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 7,506 | 17,278
Aerospace [Member] | Europe, excluding Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 20,940 | 38,987
Aerospace [Member] | China |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 8,964 | 10,212
Aerospace [Member] | Asia, excluding China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 4,480 | 6,981
Aerospace [Member] | Other Countries [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 22,231 | 36,555
Aerospace [Member] | Commercial OEM [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 76,081 | 158,666
Aerospace [Member] | Commercial Aftermarket [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 65,515 | 125,928
Aerospace [Member] | Defense OEM [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 131,263 | 140,926
Aerospace [Member] | Defense Aftermarket [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 48,808 | 48,405
Industrial [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 215,952 | 246,430
Industrial [Member] | United States [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 43,153 | 51,092
Industrial [Member] | Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 29,642 | 51,438
Industrial [Member] | Europe, excluding Germany [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 43,068 | 50,501
Industrial [Member] | China |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 65,983 | 53,876
Industrial [Member] | Asia, excluding China [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 28,635 | 31,912
Industrial [Member] | Other Countries [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 5,471 | 7,611
Industrial [Member] | Reciprocating Engines [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | 164,922 | 174,653
Industrial [Member] | Industrial Turbines [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales |  | $ 51,030 | 51,500
Industrial [Member] | Renewables [Member] |  |  |
Disaggregation Of Revenue [Line Items] |  |  |
Total net sales | [1] |  | $ 20,277
[1] |
| (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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