Revenue (Schedule of Disaggregation of Revenue) (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Disaggregation Of Revenue [Line Items]
Total net sales	$ 3,567,064	$ 3,324,249	$ 2,914,566
United States [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	1,914,281	1,698,256	1,538,075
Germany [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	275,422	269,358	273,842
Europe, excluding Germany [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	565,588	499,938	436,979
China [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	285,870	390,044	243,486
Asia, excluding China [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	249,205	222,706	200,029
Other Countries [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	276,698	243,947	222,155
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	2,312,806	2,028,618	1,768,103
Aerospace [Member] \| United States [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	1,585,173	1,404,223	1,254,954
Aerospace [Member] \| Germany [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	72,883	72,583	80,450
Aerospace [Member] \| Europe, excluding Germany [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	224,302	202,421	163,222
Aerospace [Member] \| China [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	148,192	96,136	56,773
Aerospace [Member] \| Asia, excluding China [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	61,965	59,103	37,107
Aerospace [Member] \| Other Countries [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	220,291	194,152	175,597
Aerospace [Member] \| Commercial OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	690,962	738,394	651,275
Aerospace [Member] \| Commercial Services [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	823,547	640,823	547,625
Aerospace [Member] \| Defense OEM [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	561,288	406,810	368,653
Aerospace [Member] \| Defense Services [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	237,009	242,591	200,550
Industrial [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	1,254,258	1,295,631	1,146,463
Industrial [Member] \| United States [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	329,108	294,033	283,121
Industrial [Member] \| Germany [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	202,539	196,775	193,392
Industrial [Member] \| Europe, excluding Germany [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	341,286	297,517	273,757
Industrial [Member] \| China [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	137,678	293,908	186,713
Industrial [Member] \| Asia, excluding China [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	187,240	163,603	162,922
Industrial [Member] \| Other Countries [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	56,407	49,795	46,558
Industrial [Member] \| Power Generation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	488,940	443,667	382,536
Industrial [Member] \| Transportation [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	507,376	624,762	527,498
Industrial [Member] \| Oil and Gas [Member]
Disaggregation Of Revenue [Line Items]
Total net sales	$ 257,942	$ 227,202	$ 236,429