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Accounts Receivable And Unbilled Revenue (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 27, 2013
Dec. 28, 2012
Accounts Receivable And Unbilled Revenue, Net [Abstract]    
Accounts receivable $ 29,686 $ 31,260
Unbilled revenue 9,266 6,860
Allowance for doubtful accounts (1,585) (1,251)
Accounts receivable and unbilled revenue, net $ 37,367 $ 36,869