Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Disaggregation Of Revenue [Line Items]
Total net sales	$ 1,109,705	$ 915,446	$ 3,196,727	$ 2,571,800
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	708,673	595,990	2,046,891	1,651,601
Aerospace [Member] \| Commercial OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	234,398	175,226	640,352	496,763
Aerospace [Member] \| Commercial services
Disaggregation Of Revenue [Line Items]
Total net sales	267,849	215,451	788,129	581,162
Aerospace [Member] \| Defense OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	140,725	150,358	429,890	401,068
Aerospace [Member] \| Defense services
Disaggregation Of Revenue [Line Items]
Total net sales	65,701	54,955	188,520	172,608
Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	401,032	319,456	1,149,836	920,199
Industrial [Member] \| Power Generation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	144,675	122,070	403,385	363,560
Industrial [Member] \| Transportation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	180,155	128,942	523,377	368,303
Industrial [Member] \| Oil and Gas [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	$ 76,202	$ 68,444	$ 223,074	$ 188,336