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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Dec. 30, 2012
Dec. 30, 2012
Other Businesses
Dec. 25, 2011
Other Businesses
Dec. 30, 2012
Building and Building Improvements
Minimum
Dec. 30, 2012
Building and Building Improvements
Maximum
Dec. 30, 2012
Machinery and Equipment
Minimum
Dec. 30, 2012
Machinery and Equipment
Maximum
Dec. 30, 2012
Restricted Stock
Dec. 30, 2012
Performance Shares
Dec. 30, 2012
Career Builder
Aug. 31, 2012
Economic Modeling Specialists Intl
Career Builder
Significant Accounting Policies [Line Items]                      
Percentage of ownership interests on subsidiary                   52.90%  
Business Acquisition, Percentage of Voting Interests Acquired                     74.00%
Shareholder ownership                     26.00%
Property, plant and equipment, useful life (in years)       10 years 40 years 3 years 30 years        
Investments in non-public businesses, non-operating expense   $ 2.0 $ 2.0                
Requisite service period 4 years             4 years 3 years