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Stock Based Compensation - Balance of Outstanding and Exercisable Stock Options (Detail)
$ / shares in Units, $ in Millions
 6 Months Ended
Dec. 31, 2015
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 239,840
Stock Option Awards Outstanding, Exercised | shares (402,408)
Stock Option Awards Outstanding, Forfeited | shares (4,265)
Stock Option Awards Outstanding, Balance at December 31, 2015 | shares 2,703,592
Stock Option Awards Outstanding, Exercisable at December 31, 2015 | shares 1,912,867
Weighted Average Exercise Price, Balance at June 30, 2015 | $ / shares $ 38.50
Weighted Average Exercise Price, Granted | $ / shares 84.34
Weighted Average Exercise Price, Exercised | $ / shares 29.40
Weighted Average Exercise Price, Forfeited | $ / shares 74.00
Weighted Average Exercise Price, Balance at December 31, 2015 | $ / shares 43.86
Weighted Average Exercise Price, Exercisable at December 31, 2015 | $ / shares $ 31.69
Aggregate Intrinsic Value of Stock Option Awards, Balance at December 31, 2015 | $ $ 102.5
Aggregate Intrinsic Value of Stock Option Awards, Exercisable at December 31, 2015 | $ $ 94.4