Earnings Per Share (Reconciliation of Net Earnings to Net Earnings Per Share Basic and Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share
Net earnings	$ 51,047	$ 43,753	$ 117,691	$ 131,392
Basic shares outstanding	61,341	64,781	62,015	65,088
Dilutive effect of stock options and restricted stock	1,768	1,446	1,545	1,416
Diluted shares outstanding	63,109	66,227	63,560	66,504
Basic earnings per share	$ 0.83	$ 0.68	$ 1.90	$ 2.02
Diluted earnings per share	$ 0.81	$ 0.66	$ 1.85	$ 1.98