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Accounts Receivable And Unbilled Revenue (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 27, 2014
Dec. 27, 2013
Accounts Receivable And Unbilled Revenue, Net [Abstract]    
Accounts receivable $ 35,985 $ 27,147
Unbilled revenue 9,375 8,538
Allowance for doubtful accounts (1,495) (1,674)
Accounts receivable and unbilled revenue, net $ 43,865 $ 34,011