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Stock Option Activity, Including Stock Options Granted, Exercised, and Forfeited, and Weighted Average Exercise Prices for Stock Options Outstanding and Exercisable, and Aggregate Intrinsic Value (Detail)
$ / shares in Units, $ in Millions
 3 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Stock Option Awards Outstanding, Balance at June 30, 2015 2,870,425
Stock Option Awards Outstanding, Granted 114,120
Stock Option Awards Outstanding, Exercised (112,492)
Stock Option Awards Outstanding, Forfeited (1,928)
Stock Option Awards Outstanding, Balance at September 30, 2015 2,870,125
Stock Option Awards Outstanding, Exercisable at September 30, 2015 2,064,619
Weighted Average Exercise Price, Balance at June 30, 2015 | $ / shares $ 38.50
Weighted Average Exercise Price, Granted | $ / shares 79.51
Weighted Average Exercise Price, Exercised | $ / shares 29.96
Weighted Average Exercise Price, Forfeited | $ / shares 82.07
Weighted Average Exercise Price, Balance at September 30, 2015 | $ / shares 40.43
Weighted Average Exercise Price, Exercisable at September 30, 2015 | $ / shares $ 29.87
Aggregate Intrinsic Value of Stock Option Awards, Balance at September 30, 2015 | $ $ 80.7
Aggregate Intrinsic Value of Stock Option Awards, Exercisable at September 30, 2015 | $ $ 75.4