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Employee Stock Plans - 2009 Stock Plan (Details) - shares
6 Months Ended
Apr. 23, 2015
Jul. 03, 2016
Jan. 03, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock based award vesting period   4 years  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Equity awards, term period   10 years  
2009 Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Additional shares of common stock reserved for issuance (in shares) 2,500,000    
Shares reserved for issuance   9,800,000  
Maximum additional shares   10,000,000  
Equity awards, term period   10 years  
2009 Plan | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares reserved for issuance   2,857,000 2,929,000
2009 Plan | Initial vesting | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options vesting rate   25.00%  
Stock based award vesting period   1 year  
2009 Plan | Initial vesting | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options vesting rate   25.00%  
Stock based award vesting period   1 year  
2009 Plan | Each month of service after vesting commencement date | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Periodic vesting percentage   2.08%  
2009 Plan | Each month of service after vesting commencement date | RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Periodic vesting percentage   12.50%