Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Disaggregation Of Revenue [Line Items]
Total net sales	$ 883,629	$ 835,343	$ 1,656,354	$ 1,622,073
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	561,729	497,512	1,055,611	958,268
Aerospace [Member] \| Commercial OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	167,461	183,517	321,537	354,871
Aerospace [Member] \| Commercial Aftermarket [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	201,861	163,886	365,711	301,430
Aerospace [Member] \| Defense OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	137,928	91,017	250,710	184,442
Aerospace [Member] \| Defense Aftermarket [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	54,479	59,092	117,653	117,525
Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	321,900	337,831	600,743	663,805
Industrial [Member] \| Power Generation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	111,047	106,811	216,266	204,917
Industrial [Member] \| Transportation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	141,734	173,786	258,340	348,255
Industrial [Member] \| Oil and Gas [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	$ 69,119	$ 57,234	$ 126,137	$ 110,633