Annual report pursuant to Section 13 and 15(d)

Stock Incentive Plans (Details)

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Stock Incentive Plans (Details) (USD $)
 12 Months Ended
Dec. 29, 2013
Dec. 30, 2012
Dec. 25, 2011
Share-based compensation plan disclosures      
Expiration from date of grant 10 years    
Number of common shares issued per RSU 1    
Total stock-based compensation cost $ 3,800,000 $ 3,800,000 $ 3,300,000
Income tax benefits from stock-based compensation cost 1,500,000 1,500,000 1,300,000
Total unrecognized compensation cost 3,800,000    
Shares      
Outstanding, end of period (in shares) 491    
Stock Options
      
Share-based compensation plan disclosures      
Weighted average remaining vesting period 1 year 3 months    
Shares      
Outstanding, beginning of period (in shares) 705    
Granted (in shares) 129    
Cancelled (in shares) (51)    
Exercised (in shares) (292)    
Outstanding, end of period (in shares) 491 705  
Vested and expected to vest, as of the end of the period (in shares) 447 [1]    
Exercisable as of the end of the period (in shares) 241    
Weighted Average Exercise Price      
Outstanding, beginning of period (in dollars per share) $ 27.35    
Granted (in dollars per share) $ 42.69    
Cancelled (in dollars per share) $ 31.21    
Exercised (in dollars per share) $ 25.99    
Outstanding, end of period (in dollars per share) $ 31.78 $ 27.35  
Vested and expected to vest, as of the end of the period (in dollars per share) $ 31.05 [1]    
Exercisable as of the end of the period (in dollars per share) $ 26.27    
Weighted Average Remaining Years of Contractual Life      
Outstanding, end of period 6 years 9 months 4 days    
Vested and expected to vest, as of the end of the period 6 years 6 months 29 days [1]    
Exercisable as of the end of the period 5 years 2 months 23 days    
Aggregate Intrinsic Value      
Outstanding, end of period (in dollars) 21,313,000    
Vested and expected to vest, as of the end of the period (in dollars) 19,752,000 [1]    
Exercisable as of the end of the period (in dollars) 11,780,000    
Weighted average assumptions used in estimation of fair value of options      
Risk-free interest rate (as a percent) 0.70% 0.70% 1.20%
Expected years until exercise 4 years 2 months 4 years 1 month 3 years 6 months
Expected stock volatility (as a percent) 44.40% 52.80% 60.30%
Dividend yield (as a percent) 0.00% 0.00% 0.00%
Weighted average Black-Scholes fair value per share at date of grant (in dollars per share) $ 15.19 $ 14.60 $ 14.21
Total intrinsic value of options exercised (in dollars) 8,263,000 1,477,000 657,000
Restricted Stock
      
Share-based compensation plan disclosures      
Weighted average remaining vesting period 1 year 2 months    
2007 Stock Plan
      
Share-based compensation plan disclosures      
Maximum number of shares of the company's common stock that may be issued or transferred 2,074,600    
Period following the change in control during which termination of an individual without cause will trigger vesting of award 2 years    
Vested (in shares) 216,101    
Shares      
Outstanding, end of period (in shares) 466,234    
Additional disclosure      
Number of shares outstanding 2,074,600    
2007 Stock Plan | Restricted Stock
      
Shares      
Outstanding, beginning of period (in shares) 4    
Granted (in shares) 0    
Cancelled (in shares) 0    
Vested (in shares) (4)    
Outstanding, end of period (in shares) 0    
Weighted Average Grant-Date Fair Value (per share)      
Outstanding, beginning of period (in dollars per share) $ 14.93    
Granted (in dollars per share) $ 0.00    
Cancelled (in dollars per share) $ 0.00    
Vested (in dollars per share) $ 14.93    
Outstanding, end of period (in dollars per share) $ 0.00    
2007 Stock Plan | Restricted Stock | Directors
      
Share-based compensation plan disclosures      
Vesting period 3 years    
2007 Stock Plan | Restricted Stock | Employee [Member]
      
Share-based compensation plan disclosures      
Vesting period 4 years    
2007 Stock Plan | Time Based RSUs
      
Share-based compensation plan disclosures      
Vesting period 4 years    
Shares      
Outstanding, beginning of period (in shares) 180    
Granted (in shares) 49    
Cancelled (in shares) (10)    
Vested (in shares) (80)    
Outstanding, end of period (in shares) 139    
Weighted Average Grant-Date Fair Value (per share)      
Outstanding, beginning of period (in dollars per share) $ 28.52    
Granted (in dollars per share) $ 46.58    
Cancelled (in dollars per share) $ 33.04    
Vested (in dollars per share) $ 45.73    
Outstanding, end of period (in dollars per share) $ 46.81    
2007 Stock Plan | Performance-Based RSUs | Executives and other key employees
      
Shares      
Outstanding, beginning of period (in shares) 35,000    
Granted (in shares) 31,000      
Outstanding, end of period (in shares)   35,000  
Additional disclosure      
Performance period 3 years    
Number of shares of common stock per award upon conversion 1    
Other stock-based compensation plans
      
Share-based compensation plan disclosures      
Expiration term 10 years    
Number of stock-based compensation plans 4    
Shares      
Outstanding, end of period (in shares) 24,563    
Other stock-based compensation plans | Minimum
      
Share-based compensation plan disclosures      
Vesting period 1 year    
Other stock-based compensation plans | Maximum
      
Share-based compensation plan disclosures      
Vesting period 4 years    
Long-Term Cash Incentive Plan | Deferred compensation, excluding share-based payments and retirement benefits
      
Additional disclosure      
Performance and vesting period P3Y    
Compensation expense 4,200,000 1,500,000 400,000
Accrued payroll liabilities and payroll-related liabilities | Long-Term Cash Incentive Plan | Deferred compensation, excluding share-based payments and retirement benefits
      
Additional disclosure      
Long-term cash incentive plan liability $ 6,400,000 $ 1,900,000  
[1] (1)The expected to vest options are the result of applying the pre-vesting forfeiture rate assumption to total outstanding options.