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Stock Based Compensation - Balance of Outstanding and Exercisable Stock Options (Detail)
$ / shares in Units, $ in Millions
 9 Months Ended
Mar. 31, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock Option Awards Outstanding, Balance as of June 30, 2017 | shares 2,490,168
Stock Option Awards Outstanding, Granted | shares 61,825
Stock Option Awards Outstanding, Exercised | shares (359,541)
Stock Option Awards Outstanding, Forfeited | shares (180,812)
Stock Option Awards Outstanding, Balance as of March 31, 2018 | shares 2,011,640
Stock Option Awards Outstanding, Exercisable at March 31, 2018 | shares 1,702,535
Weighted Average Exercise Price, Balance as of June 30, 2017 | $ / shares $ 49.20
Weighted Average Exercise Price, Granted | $ / shares 45.32
Weighted Average Exercise Price, Exercised | $ / shares 22.87
Weighted Average Exercise Price, Forfeited | $ / shares 64.39
Weighted Average Exercise Price, Balance as of March 31, 2018 | $ / shares 52.42
Weighted Average Exercise Price, Exercisable at March 31, 2018 | $ / shares $ 51.07
Aggregate Intrinsic Value, Balance as of March 31, 2018 | $ $ 13.3
Aggregate Intrinsic Value, Exercisable at March 31, 2018 | $ $ 13.3