Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share, Basic and Diluted [Abstract]
Net Income	$ 53,883	$ 50,712	$ 164,597	$ 150,679
Common share information:
Weighted average shares outstanding for basic earnings per share	78,805	80,880	79,608	81,502
Dilutive effect of stock options and restricted stock	362	214	283	271
Weighted average shares outstanding for diluted earnings per share	79,167	81,094	79,891	81,773
Basic earnings per share	$ 0.68	$ 0.63	$ 2.07	$ 1.85
Diluted earnings per share	$ 0.68	$ 0.63	$ 2.06	$ 1.84
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	112	0	83