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Revenue (Schedule of Revenue Recognition Time) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Disaggregation Of Revenue [Line Items]
Net sales	$ 581,321	$ 720,220	$ 1,118,940	$ 1,440,575
Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Net sales	364,706	474,236	686,373	948,161
Industrial [Member]
Disaggregation Of Revenue [Line Items]
Net sales	216,615	245,984	432,567	492,414
Point In Time [Member]
Disaggregation Of Revenue [Line Items]
Net sales	245,805	335,377	506,967	690,834
Point In Time [Member] | Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Net sales	114,563	178,325	221,530	365,840
Point In Time [Member] | Industrial [Member]
Disaggregation Of Revenue [Line Items]
Net sales	131,242	157,052	285,437	324,994
Over Time [Member]
Disaggregation Of Revenue [Line Items]
Net sales	335,516	384,843	611,973	749,741
Over Time [Member] | Aerospace [Member]
Disaggregation Of Revenue [Line Items]
Net sales	250,143	295,911	464,843	582,321
Over Time [Member] | Industrial [Member]
Disaggregation Of Revenue [Line Items]
Net sales	$ 85,373	$ 88,932	$ 147,130	$ 167,420

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