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Industry And Client Credit Risk - Additional Information (Detail)
12 Months Ended
Jan. 03, 2014
Dec. 28, 2012
Dec. 30, 2011
US Government Corporations and Agencies Securities | Accounts Receivable [Member]
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage   11.00%  
Clients In Transportation Industry and Contractors Concentration Risk
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage 9.00% 10.00% 10.00%
Government Agencies and Contractors Concentration Risk
     
Concentration Risk [Line Items]      
Concentration Risk, Percentage 8.00% 13.00% 15.00%