Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Disaggregation Of Revenue [Line Items]
Total net sales	$ 835,343	$ 718,214	$ 1,622,073	$ 1,336,833
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	497,512	437,017	958,268	832,702
Aerospace [Member] | Commercial OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	183,517	159,271	354,871	298,146
Aerospace [Member] | Commercial Aftermarket [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	163,886	139,445	301,430	266,088
Aerospace [Member] | Defense OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	91,017	87,807	184,442	177,569
Aerospace [Member] | Defense Aftermarket [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	59,092	50,494	117,525	90,899
Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	337,831	281,197	663,805	504,131
Industrial [Member] | Power Generation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	106,811	94,013	204,917	175,590
Industrial [Member] | Transportation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	173,786	118,777	348,255	207,692
Industrial [Member] | Oil and Gas [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	$ 57,234	$ 68,407	$ 110,633	$ 120,849