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Shareholders' Equity Stock Options (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 28, 2013
Dec. 29, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration Period 10 years    
Stock Option Valuation Assumptions [Abstract]      
Fair value assumptions, method used Black-Scholes-Merton option-pricing model    
Stock Options [Member]
     
Stock options activity [Roll Forward]      
Stock options - outstanding beginning of period 2,889    
Stock options - granted during period 265    
Stock options - exercised during period (757)    
Stock options - canceled/forfeited during period (643)    
Stock options - outstanding end of period 1,754 2,889  
Stock options - exercisable at end of period 1,185    
Vested and expected to vest - outstanding 1,707    
Weighted- Average Exercise Price per Share      
Stock options - weighted average exercise price per share, outstanding $ 15.92    
Stock options - weighted average exercise price per share, granted $ 20.67    
Stock options - weighted average exercise price per share, exercised $ 10.52    
Stock options - weighted average exercise price per share, forfeited/canceled $ 24.66    
Stock options - weighted average exercise price per share, outstanding $ 15.77 $ 15.92  
Stock options - weighted average exercise price per share, exercisable $ 13.62    
Stock options - weighted average exercise price per share, vested and expected to vest $ 15.66    
Weighted- Average Remaining Contractual Term      
Stock options - weighted average remaining contractual term (years) outstanding 5 years 7 months 6 days 5 years  
Stock options - weighted average remaining contractual terms (years) exercisable 4 years 3 months 18 days    
Stock options - weighted average remaining contractual term (years) vested and expected to vest 5 years 6 months    
Aggregate Intrinsic Value      
Stock options - aggregate intrinsic value outstanding $ 11,812,000 [1] $ 26,109,000 [1]  
Stock options - aggregate intrinsic value exercisable 10,180,000 [1]    
Stock options - aggregate intrinsic value vested and expected to vest 11,645,000 [1]    
Other information - options [Abstract]      
Weighted-average grant date fair value of stock options granted $ 10.57 $ 14.28 $ 10.91
Total intrinsic value (at exercise) of stock options exercised 7,726,000 12,724,000 8,295,000
Proceeds from stock options exercised 8,000,000    
Tax benefit, exercise of stock options 2,900,000    
Total stock-based compensation expense related to non-vested awards $ 4,200,000    
Weighted average period to recognize remaining expense over 2 years    
Stock Option Valuation Assumptions [Abstract]      
Expected dividend yield (in hundredths) 0.00% 0.00% 0.00%
Expected volatility (in hundredths) 61.00% 63.00% 78.00%
Risk-free interest rate (in hundredths) 0.90% 1.10% 1.90%
Expected term (in years) 5 years 8 months 12 days 5 years 7 months 6 days 5 years
Minimum [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Rights 2 years    
Maximum [Member] | Stock Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award Vesting Rights 4 years    
[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.