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Employee Stock Plans (Details) - shares
6 Months Ended
Apr. 23, 2015
Jun. 28, 2015
Apr. 22, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years  
Initial vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of options vested   25.00%  
1999 stock plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Term   10 years  
1999 stock plan | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares)     0
1999 stock plan | Initial vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year  
1999 stock plan | Periodic vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of options vested   2.08%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 month  
2009 stock plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares)   9,600,000  
Additional shares reserved for issuance (in shares) 2,500,000    
2009 stock plan | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of previously cancelled, forfeited or repurchased shares available for reissuance (in shares)   10,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Term   10 years  
2009 stock plan | Initial vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 year  
2009 stock plan | Periodic vesting      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percent of options vested   2.08%  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   1 month  
Employee stock purchase plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares)   3,300,000  
Additional shares reserved for issuance (in shares) 1,000,000.0    
Maximum percent of employees total compensation allowed for purchase of shares   20.00%  
Maximum number of shares per employee per period (in shares)   20,000  
Purchase price of shares as a percentage of fair market value   85.00%  
Share-based Compensation Arrangement by Share-based Payment Award, Offering Period   6 months