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Stockholders' Equity - Narrative (Details) - USD ($)
6 Months Ended
Jan. 01, 2020
Jun. 30, 2020
Apr. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized amount for stock repurchases     $ 1,000,000,000.0
Remaining authorized repurchase amount   $ 506,000,000.0  
Number of additional shares authorized for issuance (in shares)   2,292,000  
2014 Equity Incentive Plan | Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of additional shares authorized for issuance (in shares) 2,291,660    
Percent of shares outstanding to increase number of shares available for grant and issuance 3.00%    
Maximum increase of number of shares available for issuance (in shares) 12,500,000    
Common stock reserved for issuance (in shares)   22,300,000  
2014 Employee Stock Purchase Plan | ESPP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of additional shares authorized for issuance (in shares) 763,886    
Percent of shares outstanding to increase number of shares available for grant and issuance 1.00%    
Maximum increase of number of shares available for issuance (in shares) 2,500,000    
Common stock reserved for issuance (in shares)   3,905,368  
Shares issued during period (in shares)   51,292  
Weighted-average purchase price (in dollars per share)   $ 184.19