Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Total segment net sales	$ 652,811	$ 470,148
United States [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	336,637
Germany [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	76,113
Europe, excluding Germany [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	98,960
Asia [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	103,424
Other Countries [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	37,677
Aerospace [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	392,887
Aerospace [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	286,745
Aerospace [Member] | Germany [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	12,749
Aerospace [Member] | Europe, excluding Germany [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	39,612
Aerospace [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	24,006
Aerospace [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	29,775
Aerospace [Member] | Commercial OEM [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	140,508
Aerospace [Member] | Commercial Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	111,348
Aerospace [Member] | Defense OEM [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	101,836
Aerospace [Member] | Defense Aftermarket [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	39,195
Industrial [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	259,924
Industrial [Member] | United States [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	49,892
Industrial [Member] | Germany [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	63,364
Industrial [Member] | Europe, excluding Germany [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	59,348
Industrial [Member] | Asia [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	79,418
Industrial [Member] | Other Countries [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	7,902
Industrial [Member] | Reciprocating Engines [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	196,130
Industrial [Member] | Renewables [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	14,282
Industrial [Member] | Industrial Turbines [Member]
Disaggregation of Revenue [Line Items]
Total segment net sales	$ 49,512