Net Income Per Share - Calculations of Basic and Diluted Net Income per Share and Basic and Dilutive Weighted Average Shares Outstanding (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 [Abstract]
Net income	$ 35,834	$ 33,171	$ 107,845	$ 106,625
Weighted average shares outstanding (in shares)	75,676	83,081	77,221	83,425
Dilutive impact from:
Share-based payment awards (in shares)	506	292	431	417
Dilutive weighted average shares outstanding (in shares)	76,182	83,373	77,652	83,842
Income per share
Basic (in dollars per share)	$ 0.47	$ 0.40	$ 1.40	$ 1.28
Dilutive (in dollars per share)	$ 0.47	$ 0.40	$ 1.39	$ 1.27