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