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Receivables, Net (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 27, 2014
Dec. 28, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Customers, trade $ 53,262 $ 41,898
Other receivables 3,075 2,306
Gross receivables 56,337 44,204
Less allowance for doubtful accounts (433) (141)
Receivables, net $ 55,904 $ 44,063