Revenue (Schedule of Revenue Recognition Time) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Disaggregation Of Revenue [Line Items]
Net sales	$ 2,245,832	$ 2,495,665	$ 2,900,197
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,404,117	1,590,963	1,880,520
Industrial [Member]
Disaggregation Of Revenue [Line Items]
Net sales	841,715	904,702	1,019,677
Point In Time [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,008,655	1,182,974	1,396,261
Point In Time [Member] | Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Net sales	481,422	590,817	762,042
Point In Time [Member] | Industrial [Member]
Disaggregation Of Revenue [Line Items]
Net sales	527,233	592,157	634,219
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Net sales	1,237,177	1,312,691	1,503,936
Over Time [Member] | Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Net sales	922,695	1,000,146	1,118,478
Over Time [Member] | Industrial [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 314,482	$ 312,545	$ 385,458