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”).