Earnings Per Share (Reconciliation of Net Earnings to Net Earnings Per Share Basic and Diluted) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share
Net earnings	$ 46,001	$ 23,663	$ 114,182	$ 93,477
Basic shares outstanding	65,845	68,323	66,736	68,506
Dilutive effect of stock options and restricted stock	1,302	1,107	1,294	1,192
Diluted shares outstanding	67,147	69,430	68,030	69,698
Basic earnings per share	$ 0.70	$ 0.35	$ 1.71	$ 1.36
Diluted earnings per share	$ 0.69	$ 0.34	$ 1.68	$ 1.34