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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2015
Jun. 30, 2015
Statement Of Financial Position [Abstract]    
Allowance for doubtful accounts receivable $ 2.9  
Property and equipment, accumulated depreciation $ 75.0 $ 67.4
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 58,460,636 58,249,107
Common stock, shares outstanding 36,072,424 37,529,608
Common treasury shares 22,388,212 20,719,499