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Supplemental Balance Sheet Information Trade Receivables, Net (Details) - USD ($)
$ in Thousands
Dec. 26, 2015
Dec. 27, 2014
Trade Receivables, Net [Abstract]    
Client receivables $ 230,010 $ 219,118
Unbilled revenue 45,996 43,780
Total 276,006 262,898
Less: Allowance for doubtful accounts 5,938 4,907
Trade receivables, net $ 270,068 $ 257,991