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Acquisitions - Additional Information (Detail) - R2Net Inc. - USD ($)
$ in Millions
12 Months Ended
Sep. 12, 2017
Feb. 03, 2018
Business Acquisition [Line Items]    
Cash consideration paid $ 331.8  
Cash and cash equivalents 47.3  
Acquisition related costs   $ 8.6
Bridge Loan    
Business Acquisition [Line Items]    
Total consideration transferred $ 350.0