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Share-Based Compensation - Share-Based Compensation and Related Tax Benefit Recognized in Condensed Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total $ 14.6 $ 11.9
Income tax benefit on share-based compensation 3.7 2.9
Cost of Revenue [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total 0.5 0.4
Research and Development [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total 7.8 6.5
Selling, General, and Administrative [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]    
Total $ 6.3 $ 5.0