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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, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Net sales	$ 590,922	$ 507,664	$ 479,382	$ 445,110	$ 562,625	$ 494,810	$ 493,222	$ 487,646	$ 2,023,078	$ 2,038,303	$ 2,001,240
Aerospace [Member]
Net sales	365,305	308,582	290,690	268,599	335,207	288,480	281,426	255,770
Industrial [Member]
Net sales	$ 225,617	$ 199,082	$ 188,692	$ 176,511	$ 227,418	$ 206,330	$ 211,796	$ 231,876
U.S. Government Related [Member]
Net sales									$ 430,373	$ 364,388	$ 339,893
Percentage of total attributable to major customer									21.00%	18.00%	17.00%
U.S. Government Related [Member] | Aerospace [Member]
Net sales									$ 413,978	$ 350,713	$ 331,788
U.S. Government Related [Member] | Industrial [Member]
Net sales									16,395	13,675	8,105
Indirect Sales to U.S. Government [Member]
Net sales									$ 320,797	$ 267,230	$ 260,394
Percentage of total attributable to major customer									16.00%	13.00%	13.00%
Indirect Sales to U.S. Government [Member] | Aerospace [Member]
Net sales									$ 310,952	$ 258,391	$ 254,806
Indirect Sales to U.S. Government [Member] | Industrial [Member]
Net sales									9,845	8,839	5,588
Direct Sales to U.S. Government [Member]
Net sales									$ 109,576	$ 97,158	$ 79,499
Percentage of total attributable to major customer									5.00%	5.00%	4.00%
Direct Sales to U.S. Government [Member] | Aerospace [Member]
Net sales									$ 103,026	$ 92,322	$ 76,982
Direct Sales to U.S. Government [Member] | Industrial [Member]
Net sales									$ 6,550	$ 4,836	$ 2,517
Sales [Member] | General Electric [Member]
Percentage of total attributable to major customer									17.00%	18.00%	15.00%
Trade Accounts Receivable [Member] | U.S. Government Related [Member]
Percentage of total attributable to major customer									2.00%	3.00%
Trade Accounts Receivable [Member] | General Electric [Member]
Percentage of total attributable to major customer									14.00%	15.00%

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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