Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation Of Revenue [Line Items]
Total net sales	$ 915,446	$ 847,688	$ 2,571,800	$ 2,469,761
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	595,990	517,560	1,651,601	1,475,828
Aerospace [Member] \| Commercial OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	175,226	189,697	496,763	544,568
Aerospace [Member] \| Commercial Aftermarket [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	215,451	165,718	581,162	467,148
Aerospace [Member] \| Defense OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	150,358	96,557	401,068	280,999
Aerospace [Member] \| Defense Aftermarket [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	54,955	65,588	172,608	183,113
Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	319,456	330,128	920,199	993,933
Industrial [Member] \| Power Generation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	109,341	109,583	325,607	314,500
Industrial [Member] \| Transportation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	143,652	163,310	401,992	511,565
Industrial [Member] \| Oil and Gas [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	$ 66,463	$ 57,235	$ 192,600	$ 167,868