Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Earnings Per Share, Basic and Diluted [Abstract]
Net Income	$ 60,044	$ 53,883	$ 181,102	$ 164,597
Common share information:
Weighted average shares outstanding for basic earnings per share	77,597	78,805	77,941	79,608
Dilutive effect of stock options and restricted stock	335	362	378	283
Weighted average shares outstanding for diluted earnings per share	77,932	79,167	78,319	79,891
Basic earnings per share	$ 0.77	$ 0.68	$ 2.32	$ 2.07
Diluted earnings per share	$ 0.77	$ 0.68	$ 2.31	$ 2.06
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	89	0	74	0