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Derivatives and Fair Value of Financial Instruments (Details 3) (USD $)
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Commodities | Cost of sales    
Amount of gain or (loss) recognized for each type of derivative and its location in the Consolidated Statements of Comprehensive Income    
Amount of Gain or (Loss) Recognized in Income on Derivatives $ (5,948,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
$ (6,584,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Foreign currencies    
Amount of gain or (loss) recognized for each type of derivative and its location in the Consolidated Statements of Comprehensive Income    
Loss due to credit risk associated with derivative contracts 1,039,000us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
 
Number of counterparties 5seb_DerivativeCreditRiskNumberOfCounterparties
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
 
Foreign currencies | Cost of sales    
Amount of gain or (loss) recognized for each type of derivative and its location in the Consolidated Statements of Comprehensive Income    
Amount of Gain or (Loss) Recognized in Income on Derivatives (494,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
485,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_CostOfSalesMember
Foreign currencies | Foreign currency    
Amount of gain or (loss) recognized for each type of derivative and its location in the Consolidated Statements of Comprehensive Income    
Amount of Gain or (Loss) Recognized in Income on Derivatives 1,533,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember
765,000us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ForeignCurrencyGainLossMember
Interest rate swaps    
Amount of gain or (loss) recognized for each type of derivative and its location in the Consolidated Statements of Comprehensive Income    
Loss due to credit risk associated with derivative contracts 0us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
 
Interest rate swaps | Miscellaneous, net    
Amount of gain or (loss) recognized for each type of derivative and its location in the Consolidated Statements of Comprehensive Income    
Amount of Gain or (Loss) Recognized in Income on Derivatives $ (4,691,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= seb_MiscellaneousNetMember
$ (602,000)us-gaap_DerivativeGainLossOnDerivativeNet
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_IncomeStatementLocationAxis
= seb_MiscellaneousNetMember