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Acquisitions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 03, 2017
Dec. 01, 2017
Dec. 02, 2016
Dec. 19, 2016
Jan. 27, 2015
Business Acquisition [Line Items]          
Purchase price allocation, goodwill   $ 348,352 $ 35,802    
TubeMogul [Member]          
Business Acquisition [Line Items]          
Purchase price allocation, purchase price       $ 560,800  
Purchase price allocation, goodwill $ 348,400        
Purchase price allocation, identifiable intangible assets       113,100  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net       $ 99,300  
Fotolia [Member]          
Business Acquisition [Line Items]          
Purchase price allocation, purchase price         $ 807,500
Purchase price allocation, goodwill $ 745,100        
Purchase price allocation, identifiable intangible assets         204,400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         $ (142,000)