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Stockholders' Equity - Narrative (Details)
shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Apr. 26, 2018
USD ($)
Apr. 30, 2019
USD ($)
plan
shares
Apr. 30, 2018
USD ($)
Jan. 31, 2019
shares
Feb. 01, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock-based compensation plans | plan   3      
Unrecognized compensation cost, options | $   $ 11,000      
Employee stock purchase plan, compensation expense | $   $ 42,271 $ 269,794    
Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost, remaining weighted-average period for recognition   1 year 7 months 6 days      
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unrecognized compensation cost, remaining weighted-average period for recognition   2 years 2 months 12 days      
Service period   4 years      
Accelerated share based compensation expense | $ $ 262,800        
Shares granted (in shares)   1,174      
Unrecognized compensation cost, RSUs | $   $ 51,200      
RSUs with vesting conditions          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares granted (in shares)       700  
ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee stock purchase plan, shares purchased (in shares)   200      
Employee stock purchase plan, compensation expense | $   $ 1,900      
2018 Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reserved for future issuance (in shares)   26,800      
Annual increase in shares reserved, percentage of total shares   5.00%      
Number of shares reserved for future issuance         8,500
2018 ESPP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Reserved for future issuance (in shares)   5,300   3,800  
Annual increase in shares reserved, percentage of total shares       1.00%  
Employee contribution, maximum percentage of earnings       15.00%  
Employee stock purchase plan, purchase price of common stock, percent of market price       85.00%  
Employee stock purchase plan offering period   6 months