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Stock-Based Compensation (Nonvested Service Based Restricted Stock Units) (Details) (Restricted Stock Units (RSUs), USD $)
9 Months Ended 12 Months Ended
Sep. 28, 2014
Dec. 29, 2013
Restricted Stock Units (RSUs)
   
Number of Shares Outstanding (in shares)    
Number of shares, nonvested at beginning of period (shares) 852,508  
Number of shares, granted (shares) 349,040  
Number of shares, vested (shares) (196,686)  
Number of shares, forfeited (shares) (53,536)  
Number of shares, nonvested at end of period (shares) 951,326 852,508
Number of shares, vested and expected to vest (shares) 902,847  
Number of shares, vested at end of period (shares) 61,250  
Weighted-average vest date    
Weighted-average vest date, nonvested at beginning in years 9 months 18 days 7 months 21 days
Weighted-average vest date, nonvested at end in years 9 months 18 days 7 months 21 days
Weighted-Average vest date, vested and expected to vest in years 9 months  
Weighted-average grant date fair value (in US$ per share)    
Weighted-average grant date fair value, nonvested at beginning of period (USD per share) $ 17.36  
Weighted-average grant date fair value, granted (USD per share) $ 14.38  
Weighted-average gant date fair value, vested (USD per share) $ 14.74  
Weighted-average grant date fair value, forfeited (USD per share) $ 13.00  
Weighted-average grant date fair value, nonvested at end of period (USD per share) $ 17.06 $ 17.36