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Derivatives and Fair Value of Financial Instruments (Details 2) (USD $) | 3 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 04, 2015 bu | Dec. 31, 2014 bu | Apr. 04, 2015 lb | Dec. 31, 2010 agreement
Net commodity purchase contracts | Grain |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 33,775,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeByNatureAxis = seb_GrainMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 10,697,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeByNatureAxis = seb_GrainMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |
Net commodity purchase contracts | Hogs |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 24,200,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_HogsMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 19,800,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_HogsMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |
Net commodity purchase contracts | Sugar |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 9,390,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_SugarContractMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 15,551,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_SugarContractMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |
Net commodity purchase contracts | Soybean oil |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 960,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_SoybeanOilMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 19,620,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_SoybeanOilMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |
Net commodity purchase contracts | Soybean meal |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 365,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_SoybeanMealMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 85,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_SoybeanMealMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |
Net commodity purchase contracts | Dry whey powder |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount |  | 88,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_WheyPowderMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember | 264,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_WheyPowderMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |
Net commodity purchase contracts | Cheese |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount | 40,000 us-gaap_DerivativeNonmonetaryNotionalAmountMass / us-gaap_DerivativeByNatureAxis = seb_CheeseMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommodityPurchaseContractMember |  |  |
Net commodity sale contracts | Heating oil |  |  |  |
Derivative commodity instruments |  |  |  |
Nonmonetary notional amount |  | 4,326,000 us-gaap_DerivativeNonmonetaryNotionalAmountVolume / us-gaap_DerivativeByNatureAxis = us-gaap_HeatingOilMember / us-gaap_DerivativeInstrumentRiskAxis = seb_CommoditySaleContractMember |  |
Foreign currencies |  |  |  |
Derivative commodity instruments |  |  |  |
Notional amounts | 92,901,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | 143,961,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember | 92,901,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_ForeignExchangeContractMember |
Interest rate swaps |  |  |  |
Derivative commodity instruments |  |  |  |
Notional amounts | 163,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 163,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 163,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 25,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Number of derivative agreements | 7 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 7 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 7 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember | 3 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_InterestRateSwapMember
Term of derivative contract |  |  |  | 10 years
Eight-year interest rate exchange agreements |  |  |  |
Derivative commodity instruments |  |  |  |
Notional amounts | 22,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |  | 22,000,000 invest_DerivativeNotionalAmount / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |
Number of derivative agreements |  | 4 us-gaap_DerivativeNumberOfInstrumentsHeld / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |  |
Number of dry bulk vessel leases | 4 seb_NumberOfDryBulkVesselLeases / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |  | 4 seb_NumberOfDryBulkVesselLeases / us-gaap_DerivativeInstrumentRiskAxis = seb_InterestRateSwapOneMember |
Term of derivative contract |  | 8 years |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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