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Acquisitions and Strategic Agreements Acquisitions and Strategic Agreements (LoudCloud Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 30, 2016
Mar. 04, 2016
Payments to Acquire Businesses, Net of Cash Acquired $ 58,259 $ 186,720 $ 17,843  
Goodwill, Acquired During Period   $ 48,556    
LoudCloud Systems, Inc. [Domain]        
Payments to Acquire Businesses, Net of Cash Acquired     17,843  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Deferred Revenue       $ 1,003
Goodwill, Acquired During Period     6,838  
Intellectual Property [Member] | LoudCloud Systems, Inc. [Domain]        
Finite-lived Intangible Assets Acquired     10,600  
Other Intangible Assets [Member] | LoudCloud Systems, Inc. [Domain]        
Finite-lived Intangible Assets Acquired     $ 1,300