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Shareholders' Equity Stock Options (Details) - Employee Stock Option [Member] - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Jan. 02, 2016
Jan. 03, 2015
Dec. 28, 2013
Stock options activity [Roll Forward]      
Outstanding at January 3, 2015 1,513    
Granted 135    
Exercised (252)    
Canceled/forfeited (8)    
Outstanding at January 2, 2016 1,388 1,513  
Exercisable at January 2, 2016 1,035    
Vested and expected to vest at January 2, 2016 1,353    
Weighted- Average Exercise Price per Share      
Outstanding at January 3, 2015 $ 16.06    
Granted 32.91    
Exercised 11.77    
Canceled/Forfeited 23.46    
Outstanding at January 2, 2016 18.44 $ 16.06  
Exercisable at January 2, 2016 16.14    
Vested and expected to vest at January 2, 2016 $ 18.23    
Weighted- Average Remaining Contractual Term      
Weighted-average remaining contractual term (years) - outstanding 5 years 3 months 18 days 5 years 7 months 6 days  
Weighted-average remaining contractual terms (years) - exercisable 4 years 4 months 24 days    
Weighted-average remaining contractual term (years) - vested and expected to vest 5 years 3 months 18 days    
Aggregate Intrinsic Value      
Aggregate intrinsic value - outstanding [1] $ 7,366 $ 16,642  
Aggregate intrinsic value - exercisable [1] 6,883    
Aggregate intrinsic value - vested and expected to vest [1] $ 7,315    
Other information - options [Abstract]      
Weighted-average grant date fair value of stock options granted $ 15.94 $ 9.33 $ 10.57
Total intrinsic value (at exercise) of stock options exercised $ 4,592 $ 2,478 $ 7,726
Proceeds from stock options exercised 3,000    
Tax benefit, exercise of stock options 1,800    
Stock-based compensation expense related to non-vested awards $ 2,400    
Weighted average period to recognize remaining expense over 1 year 8 months 12 days    
Stock Option Valuation Assumptions [Abstract]      
Fair value assumptions, method used Black-Scholes-Merton option-pricing model    
Expected dividend yield (in hundredths) 0.00% 0.00% 0.00%
Expected volatility (in hundredths) 54.00% 58.00% 61.00%
Risk-free interest rate (in hundredths) 1.60% 1.80% 0.90%
Expected term (in years) 5 years 2 months 12 days 5 years 3 months 18 days 5 years 8 months 12 days
[1] Aggregate intrinsic value includes only those options where the current share price is equal to or greater than the share price on the date of grant.