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Stock Based Compensation - Balance of Outstanding and Exercisable Stock Options (Detail)
$ / shares in Units, $ in Millions
 3 Months Ended
Sep. 30, 2017
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 (38,258)
Stock Option Awards Outstanding, Forfeited | shares (29,228)
Stock Option Awards Outstanding, Balance as of September 30, 2017 | shares 2,484,507
Stock Option Awards Outstanding, Exercisable at September 30, 2017 | shares 1,946,103
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 27.46
Weighted Average Exercise Price, Forfeited | $ / shares 65.10
Weighted Average Exercise Price, Balance as of September 30, 2017 | $ / shares 49.25
Weighted Average Exercise Price, Exercisable at September 30, 2017 | $ / shares $ 45.64
Aggregate Intrinsic Value, Balance as of September 30, 2017 | $ $ 13.8
Aggregate Intrinsic Value, Exercisable at September 30, 2017 | $ $ 13.8