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Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Earnings Per Share [Abstract]      
Net income $ 65,419 $ 81,789 $ 34,662
Denominator: Weighted-average shares, basic (in shares) 28,558,000 28,337,000 27,774,000
Denominator: Dilutive effect of share-based payments (in shares) 241,000 265,000 220,000
Denominator: Weighted-average shares, diluted (in shares) 28,799,000 28,602,000 27,994,000
Net income per common share, basic (in dollars per share) $ 2.29 $ 2.89 $ 1.25
Net income per common share, diluted (in dollars per share) $ 2.27 $ 2.86 $ 1.24
Weighted average shares excluded from the computation of diluted earnings per share (in shares) 340,697 230,706 1,062,000