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Stockholders' Equity - Narrative (Details) - USD ($)
shares in Thousands, $ in Millions
1 Months Ended 3 Months Ended
May 31, 2015
Mar. 30, 2019
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares)   10,021
Market-based Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Granted (in shares)   500
Employee Stock Options And Restricted Stock Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized compensation expense related to unvested options   $ 138.8
Unrecognized compensation expense related to unvested options, estimated weighted average period   2 years 2 months 12 days
Common Class A [Member] | 2015 Employee Stock Purchase Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for future issuance   24,400
Common Class A [Member] | 2015 Employee Stock Purchase Plan [Member] | Stock options to purchase common stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percent of share price available to employees 85.00%