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Acquisition - Additional Information (Detail) - R2Net Inc. - USD ($)
$ in Millions
9 Months Ended
Sep. 12, 2017
Oct. 28, 2017
Business Acquisition [Line Items]    
Base-line purchase price $ 332.4  
Cash and cash equivalents 47.3  
Acquisition related costs   $ 9.4
Bridge Loan    
Business Acquisition [Line Items]    
Total consideration transferred $ 350.0