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Share-Based Compensation - Schedule of Intrinsic Value of Options Exercised (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of options exercised $ 20.5 $ 49.4 $ 51.8