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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share
Net earnings	$ 43,753	$ 46,001	$ 131,392	$ 114,182
Basic shares outstanding	64,781	65,845	65,088	66,736
Dilutive effect of stock options and restricted stock	1,446	1,302	1,416	1,294
Diluted shares outstanding	66,227	67,147	66,504	68,030
Basic earnings per share	$ 0.68	$ 0.70	$ 2.02	$ 1.71
Diluted earnings per share	$ 0.66	$ 0.69	$ 1.98	$ 1.68