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Description of Business and Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 29, 2016
Apr. 28, 2017
Apr. 29, 2016
Apr. 24, 2015
Description Of Business And Significant Accounting Policies [Line Items]        
Provision for income taxes   $ 156 $ 116 $ 153
Minimum | Software maintenance and Hardware maintenance services        
Description Of Business And Significant Accounting Policies [Line Items]        
Maintenance contractual term   1 year    
Minimum | Developed Technology        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   3 years    
Minimum | Customer Contracts/Relationships        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   2 years    
Minimum | Covenants not to Compete        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   2 years    
Minimum | Trademarks and Trade Names        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   2 years    
Maximum | Software maintenance and Hardware maintenance services        
Description Of Business And Significant Accounting Policies [Line Items]        
Maintenance contractual term   5 years    
Maximum | Developed Technology        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   6 years    
Maximum | Customer Contracts/Relationships        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   8 years    
Maximum | Covenants not to Compete        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   3 years    
Maximum | Trademarks and Trade Names        
Description Of Business And Significant Accounting Policies [Line Items]        
Finite-Lived Intangible Asset, Useful Life   7 years    
Accounting Standards Update 2016-09        
Description Of Business And Significant Accounting Policies [Line Items]        
Provision for income taxes   $ 18    
Accounting Standards Update 2016-09 | Account for Forfeitures As Occur        
Description Of Business And Significant Accounting Policies [Line Items]        
Cumulative-effect impact to retained earnings $ 7      
Accounting Standards Update 2016-09 | Forfeiture Rate Policy Change On Outstanding Stock Based Awards        
Description Of Business And Significant Accounting Policies [Line Items]        
Cumulative-effect adjustment to retained earnings (3)      
Accounting Standards Update 2016-09 | Previously Unrecognized Tax Benefits        
Description Of Business And Significant Accounting Policies [Line Items]        
Cumulative-effect adjustment to retained earnings $ 17