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Employee Benefit Plans - Additional Information (Detail) (USD $)
 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Dec. 25, 2010
Dec. 26, 2009
Dec. 29, 2012
Employee Stock Purchase Plan [Member]
Dec. 31, 2011
Employee Stock Purchase Plan [Member]
Dec. 25, 2010
Employee Stock Purchase Plan [Member]
Dec. 29, 2012
Employee Stock Purchase Plan [Member]
Maximum [Member]
Dec. 29, 2012
Employee Stock Options [Member]
Dec. 29, 2012
Employee Stock Options [Member]
Maximum [Member]
Dec. 29, 2012
Employee Stock Options [Member]
Minimum [Member]
Dec. 29, 2012
Restricted Stock Units [Member]
Maximum [Member]
Dec. 29, 2012
Restricted Stock Units [Member]
Minimum [Member]
Mar. 31, 2012
Performance Stock Units [Member]
Dec. 29, 2012
Performance Stock Units [Member]
Dec. 29, 2012
Performance Stock Units [Member]
Maximum [Member]
Dec. 29, 2012
Performance Stock Units [Member]
Minimum [Member]
Dec. 29, 2012
Unvested stock options [Member]
Dec. 29, 2012
Unvested restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                      
Matching contribution of eligible employee compensation, percent 1.50% 1.50%                                  
Employer contributions to plan $ 500,000 $ 500,000 $ 0                                
Net periodic benefit cost 300,000 400,000 300,000                                
Weighted average discount rate of accumulated post-retirement benefit obligation 3.70% 4.20% 5.40%                                
Assumed annual rates of increase of cost of health benefits 9.00%                                    
Assumed annual rate of decrease for cost of health benefits 0.50%                                    
Defined benefit plan cost of health benefit, trend rate 5.00%                                    
Defined benefit plan cost of health benefit, year that rate reaches ultimate rate 2021                                    
Result of one percent increase in net periodic benefit cost 13,000                                    
Result of one percent decrease in net periodic benefit cost 13,000                                    
Result of one percent increase in accumulated post-retirement benefit obligation 322,000                                    
Result of one percent decrease in accumulated post-retirement benefit obligation 269,000                                    
Payroll liability in accrued compensation and benefits 2,100,000 2,000,000                                  
Cash surrender value of the related life insurance policies 1,700,000 1,600,000                                  
Shares for issuance under Employee Stock Purchase Plan               1,900,000                      
Percentage of fair value of common stock, common stock price         85.00%           100.00%                
Shares issued under Employee Stock Purchase Plan         151,812 120,240 112,745                        
Shares available for equity grants         485,542       1,931,575                    
Range of period in which vested stock expire                 10 years                    
Maximum period in which vested stock become exercisable                   4 years 1 year 4 years 1 year   3 years        
Aggregate intrinsic value of options exercised 200,000 600,000   800,000                              
Aggregate intrinsic value of options outstanding 2,800,000                                    
Aggregate intrinsic value of options exercisable 1,900,000                                    
Number of common share granted                           128,916          
Award measurement period                             1 year        
Common stock granted on achievement of performance goals                               150.00% 0.00%    
Pre-tax unrecognized compensation cost of unvested stock options                                   2,800,000  
Weighted-average period of compensation cost                                   1 year 6 months 2 years 3 months 18 days
Pre-tax unrecognized compensation cost of unvested restricted stock units                                     $ 5,900,000