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		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income	$ 37,010	$ 36,683	$ 72,011	$ 73,454
Weighted average shares outstanding (in shares)	76,905	83,315	77,977	83,596
Dilutive impact from:
Share-based payment awards (in shares)	413	388	379	439
Dilutive weighted average shares outstanding (in shares)	77,318	83,703	78,356	84,035
Income per share
Basic (in dollars per share)	$ 0.48	$ 0.44	$ 0.92	$ 0.88
Dilutive (in dollars per share)	$ 0.48	$ 0.44	$ 0.92	$ 0.87