Earnings Per Share Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Net Income	$ 59,252	$ 69,086	$ 210,892	$ 297,199
Common share information:
Weighted average shares outstanding for basic earnings per share	77,177	77,247	77,194	77,249
Dilutive effect of stock options and restricted stock	109	299	217	337
Weighted average shares outstanding for diluted earnings per share	77,286	77,546	77,411	77,586
Basic earnings per share	$ 0.77	$ 0.89	$ 2.73	$ 3.85
Diluted earnings per share	$ 0.77	$ 0.89	$ 2.72	$ 3.83
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	20	49	14	36