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Stock-Based Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 6 Months Ended
May 31, 2016
Jun. 30, 2011
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate intrinsic value of options exercised in period     $ 42.6
Fair value of options vested in period     3.6
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock-based compensation expense     $ 8.9
Unrecognized stock-based compensation expense, weighted-average recognition period     2 years 7 months 6 days
Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unrecognized stock-based compensation expense     $ 40.7
Unrecognized stock-based compensation expense, weighted-average recognition period     2 years 3 months 18 days
Restricted share unit issued     277,000
Performance Based Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share unit issued   100,000  
Shares of award granted, upon achievement of service milestone     100,000
Performance Based Restricted Stock Units | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted share unit issued 190,890