Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Net Income	$ 53,982	$ 40,505	$ 103,770	$ 82,981
Common share information:
Weighted average shares outstanding for basic earnings per share	85,450	86,084	85,372	86,097
Dilutive effect of stock options and restricted stock	536	555	548	525
Weighted average shares outstanding for diluted earnings per share	85,986	86,639	85,920	86,622
Basic earnings per share	$ 0.63	$ 0.47	$ 1.22	$ 0.96
Diluted earnings per share	$ 0.63	$ 0.47	$ 1.21	$ 0.96
Antidilutive stock options and restricted stock excluded from computation of earnings per share	0	0	9	149