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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, 2016
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock Option Awards Outstanding, Balance at June 30, 2015 | shares 2,870,425
Stock Option Awards Outstanding, Granted | shares 338,251
Stock Option Awards Outstanding, Exercised | shares (499,351)
Stock Option Awards Outstanding, Forfeited | shares (17,954)
Stock Option Awards Outstanding, Balance at March 31, 2016 | shares 2,691,371
Stock Option Awards Outstanding, Exercisable at March 31, 2016 | shares 1,932,151
Weighted Average Exercise Price, Balance at June 30, 2015 | $ / shares $ 38.50
Weighted Average Exercise Price, Granted | $ / shares 81.18
Weighted Average Exercise Price, Exercised | $ / shares 29.77
Weighted Average Exercise Price, Forfeited | $ / shares 70.40
Weighted Average Exercise Price, Balance at March 31, 2016 | $ / shares 45.27
Weighted Average Exercise Price, Exercisable at March 31, 2016 | $ / shares $ 33.50
Aggregate Intrinsic Value of Stock Option Awards, Balance at March 31, 2016 | $ $ 83.9
Aggregate Intrinsic Value of Stock Option Awards, Exercisable at March 31, 2016 | $ $ 80.2