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Employee Stock Plans - 1999 Stock Plan (Details) - shares
9 Months Ended
Sep. 27, 2015
Apr. 22, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based award vesting period 4 years  
1999 Plan | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity awards, term period 10 years  
1999 Plan | Initial Vesting    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based award vesting period 1 year  
1999 Plan | Periodic Vesting    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock based award vesting period 1 month  
Stock Options | 1999 Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares reserved for issuance (in shares)   0
Stock Options | 1999 Plan | Initial Vesting    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options vesting rate 25.00%  
Stock Options | 1999 Plan | Periodic Vesting    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Options vesting rate 2.08%