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Summary of Significant Accounting Policies and New Accounting Standards (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Accounting Policies [Abstract]      
Net income $ 64,615 $ 82,728 $ 60,280
Weighted average number of shares - basic 39,524 39,254 38,969
Dilutive effect of stock options 518 708 846
Weighted average number of shares - diluted 40,042 39,962 39,815
Net income per share      
basic (in dollars per share) $ 1.63 $ 2.11 $ 1.55
diluted (in dollars per share) $ 1.61 $ 2.07 $ 1.51