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NATURE OF OPERATIONS AND ACCOUNTING POLICIES. (Details 3) (Interest rate swap, Designated, Cash flow, USD $)
In Millions, unless otherwise specified
Dec. 27, 2014
Interest rate swap | Designated | Cash flow
  
Financial instruments and fair value  
Notional amount $ 5.0invest_DerivativeNotionalAmount
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
Fixed interest rate (as a percent) 3.10%us-gaap_DerivativeFixedInterestRate
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember