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Supplemental Quarterly Financial Data (Unaudited) (Quarterly Financial Information - Segment Reporting) (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
Interest expense, net	(6,585)	(5,912)	(5,793)	(6,461)	(7,289)	(5,858)	(5,108)	(5,822)	(24,751)	(24,077)	(22,533)
Consolidated earnings before income taxes	80,756	63,408	54,366	27,956	68,727	57,559	57,591	57,072	$ 226,486	$ 240,949	$ 227,244
Total of Reporting Segments [Member]
Segment earnings (loss)	99,630	79,689	70,047	65,037	89,494	76,981	72,852	75,061
Aerospace [Member]
Net sales	365,305	308,582	290,690	268,599	335,207	288,480	281,426	255,770
Segment earnings (loss)	80,376	57,726	50,578	43,486	59,964	46,362	45,628	35,793
Industrial [Member]
Net sales	225,617	199,082	188,692	176,511	227,418	206,330	211,796	231,876
Segment earnings (loss)	19,254	21,963	19,469	21,551	29,530	30,619	27,224	39,268
Unallocated Corporate [Member]
Segment earnings (loss)	$ (12,289)	$ (10,369)	$ (9,888)	$ (30,620)	$ (13,478)	$ (13,564)	$ (10,153)	$ (12,167)

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
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