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Stock Based Compensation - Additional Information (Detail) (USD $)
6 Months Ended 1 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended
Jul. 13, 2013
Dec. 29, 2012
May 31, 2013
Chief Executive Officer
Jul. 13, 2013
Return On Invested Capital
Jul. 13, 2013
Return On Invested Capital
Range One
Jul. 13, 2013
Return On Invested Capital
Range Two
Jul. 13, 2013
Return On Invested Capital
Range Three
Jul. 13, 2013
TSR Rank Less Than 50th Percentile Of S&P TSR
Jul. 13, 2013
TSR Rank Greater Than 50th Percentile Of S&P TSR
Jul. 13, 2013
Minimum
Jul. 13, 2013
Maximum
Jul. 13, 2013
Weighted Average Cost of Capital
Jul. 13, 2013
Weighted Average Cost of Capital
Range One
Jul. 13, 2013
Weighted Average Cost of Capital
Range Two
Jul. 13, 2013
Weighted Average Cost of Capital
Range Three
Jul. 13, 2013
2012 awards
Jul. 13, 2013
2013 awards
Jul. 13, 2013
Performance Contingent Restricted Stock
Jul. 13, 2013
Total share holder return
Jul. 13, 2013
Deferred Stock
Jul. 13, 2013
Deferred Stock
Non Employee Directors
Jul. 13, 2013
Deferred Stock
Retainer Conversion
Jul. 13, 2013
Deferred Stock
Annual Grant Awards
Jul. 13, 2013
Deferred Stock
Minimum
May 31, 2013
Restricted Stock Award
Chief Executive Officer
Jul. 13, 2013
Deferred Stock Activity
Jul. 13, 2013
Stock Appreciation Rights
Dec. 29, 2012
Stock Appreciation Rights
Jul. 13, 2013
Stock Appreciation Rights
Minimum
Jul. 13, 2013
Stock Appreciation Rights
Maximum
Jul. 13, 2013
Stock Option
Jul. 13, 2013
Total Shareholders Return
Jul. 13, 2013
Performance Contingent Total Shareholder Return Shares
Performance contingent Awards 2012
Jul. 13, 2013
Performance Contingent Total Shareholder Return Shares
Performance contingent Awards 2013
Jul. 13, 2013
Performance Contingent Return On Invested Capital Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                      
Aggregate number of shares that may be issued or transferred under EPIP 41,906,250                                                                    
Unrecognized compensation cost related to nonvested restricted stock granted by the EPIP $ 6,400,000                                 $ 12,500,000               $ 2,800,000         $ 1,000,000       $ 6,100,000
Expected weighted-average period to recognize compensation cost (years) 1 year 4 months 24 days                                   1 year 4 months 24 days                       6 months 29 days       1 year 4 months 24 days
Vesting period                                                                 17 months 2 years  
Share-based payment award, fair value assumptions, method used                                                               Inputs into the model included the following for the company and comparator companies (i) TSR from the beginning of the performance cycle through the measurement date; (ii) volatility; (iii) risk-free interest rates; and (iv) the correlation of the comparator companies' TSR. The inputs are based on historical capital market data.      
Vesting period 1 year 6 months                                 2 years   1 year 1 year     2 years     1 year               1 year 6 months
Return on investment target over the two fiscal years immediately preceding the vesting date                   1.75% 4.75%             3.75%                                  
Percentage of shares that can be earned                   0.00% 125.00%                                                
Percentage of payout       0.00%               1.75%                                              
Percentage of payout, ROIC above WACC         1.75% 3.75% 4.75%           50.00% 100.00% 125.00%                                        
Percentage of ROI target                               125.00% 100.00%                                    
Dividends paid on vested performance-contingent restricted stock awards 386,000                                 400,000                                  
Maximum percentage of change in grant               20.00% 20.00%                                                    
Additional common shares issued                                     94,777                                
Percentage of change in grant               (1.30%) 1.30%                                                    
Award vesting tax windfall                                   2,100,000               100,000                  
Total fair value of shares vested                                   10,600,000                                  
Deferred shares exercised                                           36,088 45,088     81,000                  
Aggregate shares converted                                       36,150 54,150                            
Restricted stock award     1,300,000                                                                
Restricted shares issued     58,500                                                                
Restricted shares per share                                                 $ 22.25                    
Exercisable period                                                     9 years                
Other long-term liabilities 54,702,000 48,891,000                                                 2,700,000 1,700,000              
Stock Issued During Period, Value, Stock Options Exercised $ 9,289,000                                                   $ 600,000                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period                                                     32,400       943,000        
Fair value of rights                                                         $ 14.72 $ 18.53          
Dividend yield                                                     2.50%                
Expected volatility                                                     28.00%                
Risk-free interest                                                     0.37%                
Expected life                                                         3 months 1 year 5 months 12 days