Segment Information (Consolidated Net Sales and Earnings 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
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
Aerospace [Member]
Net sales									1,233,176	1,160,883	1,084,025
Segment earnings (loss)									232,166	187,747	159,200
Industrial [Member]
Net sales									789,902	877,420	917,215
Segment earnings (loss)									82,237	126,641	134,278
Total of Reporting Segments [Member]
Segment earnings (loss)									314,403	314,388	293,478
Unallocated Corporate [Member]
Segment earnings (loss)									$ (63,166)	$ (49,362)	$ (43,701)