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Employee Stock Plans (Details)
9 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 28, 2014
Sep. 28, 2014
1999 Stock Plan [Member]
Maximum [Member]
Sep. 28, 2014
1999 Stock Plan [Member]
Stock Options [Member]
Sep. 28, 2014
1999 Stock Plan [Member]
Initial Vesting [Member]
Sep. 28, 2014
1999 Stock Plan [Member]
Periodic Vesting [Member]
Apr. 28, 2011
2009 Stock Plan [Member]
Sep. 28, 2014
2009 Stock Plan [Member]
Sep. 28, 2014
2009 Stock Plan [Member]
Maximum [Member]
Sep. 28, 2014
2009 Stock Plan [Member]
Initial Vesting [Member]
Sep. 28, 2014
2009 Stock Plan [Member]
Periodic Vesting [Member]
Sep. 28, 2014
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Equity award, term   10 years           10 years      
Equity award vesting period 4 years     1 year 1 month       1 year 1 month  
Percent of options vested       25.00% 2.08%         2.08%  
Shares available for grant (in shares)     0                
Additional shares reserved for issuance (in shares)           1,500,000          
Shares reserved for issuance (in shares)             7,000,000       2,300,000
Number of previously cancelled, forfeited or repurchased shares available for reissuance (in shares)               7,500,000      
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%
Duration of offering period                     6 months