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Segment Information (U.S. Government Related Sales by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019		Jun. 30, 2019		Mar. 31, 2019		Dec. 31, 2018		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 531,264	$ 523,826	$ 720,220	$ 720,355	$ 736,537		$ 752,005		$ 758,844		$ 652,811		$ 2,495,665	$ 2,900,197	$ 2,325,873
Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	336,308	306,494	474,236	473,925	505,904		498,775		482,954		392,887		1,590,963	1,880,520
Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales	$ 194,956	$ 217,332	$ 245,984	$ 246,430	$ 230,633	[1]	$ 253,230	[1]	$ 275,890	[1]	$ 259,924	[1]	904,702	1,019,677
Direct Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													155,283	122,825	86,799
Direct Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													149,416	118,334	84,252
Direct Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													$ 5,867	$ 4,491	$ 2,547
Direct Sales to U.S. Government [Member] | Sales [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue													6.00%	4.00%	4.00%
Indirect Sales to U.S. Government [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													$ 553,897	$ 559,116	$ 438,044
Indirect Sales to U.S. Government [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													536,424	545,306	429,386
Indirect Sales to U.S. Government [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													$ 17,473	$ 13,810	$ 8,658
Indirect Sales to U.S. Government [Member] | Sales [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue													22.00%	19.00%	19.00%
U.S. Government Related [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													$ 709,180	$ 681,941	$ 524,843
U.S. Government Related [Member] | Aerospace [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													685,840	663,640	513,638
U.S. Government Related [Member] | Industrial [Member]
Entity Wide Revenue Major Customer [Line Items]
Net sales													$ 23,340	$ 18,301	$ 11,205
U.S. Government Related [Member] | Sales [Member]
Entity Wide Revenue Major Customer [Line Items]
Percentage of attributable to revenue													28.00%	23.00%	23.00%
[1] Industrial segment earnings for the first through third quarters of fiscal year 2019 include pre-tax non-cash charges of $9,511, $8,985, $2,604, respectively.  These costs are associated with the purchase accounting impacts related to the revaluation of the L’Orange inventory recognized in cost of goods sold and the amortization of the backlog intangible.

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