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Investments in and Advances to Affiliates and Notes Receivable from Affiliates (Details) (USD $)
12 Months Ended 9 Months Ended 0 Months Ended 12 Months Ended 3 Months Ended 1 Months Ended 3 Months Ended 1 Months Ended
Dec. 31, 2014
Sep. 27, 2014
item
Sep. 27, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 28, 2013
Dec. 31, 2014
Dec. 31, 2010
Oct. 01, 2011
Sep. 28, 2013
Jul. 27, 2013
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Investments in and advances to affiliates $ 523,063,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures     $ 406,900,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures     $ 523,063,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures        
Notes receivable from affiliates 197,270,000us-gaap_NotesReceivableRelatedPartiesNoncurrent     180,386,000us-gaap_NotesReceivableRelatedPartiesNoncurrent     197,270,000us-gaap_NotesReceivableRelatedPartiesNoncurrent        
Proceeds from the sale of controlling interest in a subsidiary 74,142,000us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates                    
Gain on sale of controlling interest in subsidiary 65,955,000us-gaap_GainOrLossOnSaleOfStockInSubsidiary                    
Additional investment or capital contribution 3,886,000seb_EquityMethodInvestmentAdditionalInvestment                    
Receivables due from affiliates 201,870,000us-gaap_DueFromRelatedPartiesCurrent     145,041,000us-gaap_DueFromRelatedPartiesCurrent     201,870,000us-gaap_DueFromRelatedPartiesCurrent        
Divestiture of a 50% interest in Daily's                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Proceeds from the sale of controlling interest in a subsidiary   74,142,000us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
                 
Gain on sale of controlling interest in subsidiary   65,955,000us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
                 
Number of processing plants   2seb_NumberOfProcessingPlants
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
2seb_NumberOfProcessingPlants
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
               
Decrease (increase) in investments in and advances to affiliates   74,142,000seb_IncreaseDecreaseInInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
                 
Pork segment                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
      50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
       
Investments in and advances to affiliates 79,832,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
          79,832,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
       
Combined condensed financial information of the non-controlled, non-consolidated affiliates                      
Net sales 71,173,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
                   
Net income (loss) 7,381,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
                   
Total assets 175,055,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
          175,055,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
       
Total liabilities 15,238,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
          15,238,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
       
Total equity 159,817,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
          159,817,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
       
Pork segment | Divestiture of a 50% interest in Daily's                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Excess of fair value over book value on sale     32,978,000seb_FairValueOfInvestmentsExceedingBookValue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Fair value of investment   74,142,000seb_InvestmentOwnedAtFairValueBeforeAdditionalEquityContribution
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
74,142,000seb_InvestmentOwnedAtFairValueBeforeAdditionalEquityContribution
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Additional investment or capital contribution     2,000,000seb_EquityMethodInvestmentAdditionalInvestment
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Beginning total investment in affiliate   76,142,000us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
76,142,000us-gaap_InvestmentOwnedAtFairValue
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Commodity Trading and Milling                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Investments in and advances to affiliates 178,344,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
    197,036,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
    178,344,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
       
Excess of carrying value of investment in affiliates over entity's share of affiliates' book value 13,655,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
          13,655,000us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
       
Combined condensed financial information of the non-controlled, non-consolidated affiliates                      
Net sales 2,222,591,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
    1,907,647,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
1,510,101,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
           
Net income (loss) (20,169,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
    7,857,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
24,686,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
           
Total assets 1,132,120,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
    1,038,978,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
862,992,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
  1,132,120,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
       
Total liabilities 731,984,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
    614,623,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
469,265,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
  731,984,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
       
Total equity 400,136,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
    424,355,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
393,727,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
  400,136,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
       
Marine                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Investments in and advances to affiliates 17,333,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
          17,333,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
       
Combined condensed financial information of the non-controlled, non-consolidated affiliates                      
Total assets 118,823,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
          118,823,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
       
Total liabilities 36,379,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
          36,379,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
       
Total equity 82,444,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
          82,444,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
       
Sugar                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Investments in and advances to affiliates 2,994,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
    2,768,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
    2,994,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
       
Combined condensed financial information of the non-controlled, non-consolidated affiliates                      
Net sales 9,191,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
    12,073,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
12,107,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
           
Net income (loss) 1,684,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
    1,349,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
194,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
           
Total assets 8,178,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
    9,271,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
8,865,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
  8,178,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
       
Total liabilities 1,660,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
    3,158,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
2,839,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
  1,660,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
       
Total equity 6,518,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
    6,113,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
6,026,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
  6,518,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_SugarMember
       
Turkey                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Investments in and advances to affiliates 244,560,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
    207,096,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
    244,560,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
       
Combined condensed financial information of the non-controlled, non-consolidated affiliates                      
Net sales 1,833,141,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
    1,729,568,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
1,437,376,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
           
Net income (loss) 104,130,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
    (19,556,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
38,384,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
           
Total assets 1,021,182,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
    907,004,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
871,945,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
  1,021,182,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
       
Total liabilities 547,398,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
    504,581,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
443,291,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
  547,398,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
       
Total equity 473,784,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
    402,423,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
428,654,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
  473,784,000us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity
/ us-gaap_StatementBusinessSegmentsAxis
= seb_TurkeyMember
       
Triumph | Pork segment                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership interest sold   50.00%seb_PercentageOfOwnershipInterestSold
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
50.00%seb_PercentageOfOwnershipInterestSold
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Triumph | Pork segment | Divestiture of a 50% interest in Daily's                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership interest sold   50.00%seb_PercentageOfOwnershipInterestSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
50.00%seb_PercentageOfOwnershipInterestSold
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Proceeds from the sale of controlling interest in a subsidiary     74,142,000us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Gain on sale of controlling interest in subsidiary     65,955,000us-gaap_GainOrLossOnSaleOfStockInSubsidiary
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Gain on sale of controlling interest in subsidiary, net of tax     40,233,000seb_GainOrLossOnSaleOfStockInSubsidiaryNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Gain on sale of controlling interest in subsidiary, net of tax (in dollars per share)     $ 34.14seb_GainOnSaleOfControllingInterestInSubsidiaryNetOfTax
/ us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis
= seb_DivestitureOfPortionOfDailysPremiumMeatsMember
/ dei_LegalEntityAxis
= seb_TriumphFoodsLlcMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_PorkSegmentMember
               
Democratic Republic of Congo                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Notes receivable from affiliates 57,390,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentGeographicRegionAxis
= country_CD
          57,390,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentGeographicRegionAxis
= country_CD
       
Increase in long-term notes receivable from affiliates       26,290,000us-gaap_IncreaseDecreaseInNotesReceivableRelatedParties
/ invest_InvestmentGeographicRegionAxis
= country_CD
             
Businesses conducting flour, maize and feed milling and poultry production and processing | Brazil                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Democratic Republic of Congo                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Gambia                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_GM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_GM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Kenya | Minimum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_KE
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          35.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_KE
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Kenya | Maximum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_KE
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_KE
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Lesotho                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_LS
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_LS
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Nigeria | Minimum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_NG
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_NG
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Nigeria | Maximum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 48.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_NG
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          48.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_NG
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | South Africa | Minimum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          30.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | South Africa | Maximum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Zambia                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Colombia | Minimum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CO
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CO
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Colombia | Maximum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 42.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CO
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          42.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CO
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Ecuador | Minimum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_EC
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_EC
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Ecuador | Maximum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_EC
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_EC
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Businesses conducting flour, maize and feed milling and poultry production and processing | Haiti                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_HT
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
          23.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_HT
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BusinessesConductingFlourMaizeAndFeedMillingAndPoultryProductionAndProcessingMember
       
Bakery business | Democratic Republic of Congo                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership           50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
  50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
  50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
 
Investment in equity and long-term advances 34,556,000seb_InvestmentsInEquityAndLongTermAdvances
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
                   
Decrease (increase) in investments in and advances to affiliates           (26,290,000)seb_IncreaseDecreaseInInvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
         
Increase in long-term notes receivable from affiliates       26,290,000seb_IncreaseDecreaseInNotesReceivableFromAffiliatesNoncurrent
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
  26,290,000seb_IncreaseDecreaseInNotesReceivableFromAffiliatesNoncurrent
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
         
Bakery business | Democratic Republic of Congo | Commodity Trading and Milling                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Write-down in loss from affiliate             10,772,000us-gaap_EquityMethodInvestmentOtherThanTemporaryImpairment
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_CommodityTradingAndMillingMember
       
Bakery business | Democratic Republic of Congo | Seaboard                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Investment in equity and long-term advances 2,595,000seb_InvestmentsInEquityAndLongTermAdvances
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ dei_LegalEntityAxis
= seb_SeaboardMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
    4,531,000seb_InvestmentsInEquityAndLongTermAdvances
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ dei_LegalEntityAxis
= seb_SeaboardMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
24,814,000seb_InvestmentsInEquityAndLongTermAdvances
/ invest_InvestmentGeographicRegionAxis
= country_CD
/ dei_LegalEntityAxis
= seb_SeaboardMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_BakeryBusinessMember
           
Agricultural commodity trading businesses | Australia                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_AU
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_GrainTradingBusinessMember
          25.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_AU
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_GrainTradingBusinessMember
       
Agricultural commodity trading businesses | Peru                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_PE
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_GrainTradingBusinessMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_PE
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_GrainTradingBusinessMember
       
Cargo terminal business | Jamaica | Marine                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_JM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_CargoTerminalBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_JM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_CargoTerminalBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_JM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_CargoTerminalBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
      21.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_JM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_CargoTerminalBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
       
Investments in and advances to affiliates   17,333,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_JM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_CargoTerminalBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
17,333,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_JM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_CargoTerminalBusinessMember
/ us-gaap_StatementBusinessSegmentsAxis
= seb_MarineMember
               
Sugar related businesses | Argentina                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Number of businesses 2seb_NumberOfBusiness
/ invest_InvestmentGeographicRegionAxis
= country_AR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_SugarRelatedBusinessMember
                   
Sugar related businesses | Argentina | Minimum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 46.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_AR
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_SugarRelatedBusinessMember
          46.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_AR
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_SugarRelatedBusinessMember
       
Sugar related businesses | Argentina | Maximum                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_AR
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_SugarRelatedBusinessMember
          50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_AR
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_SugarRelatedBusinessMember
       
Butterball, LLC                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage ownership acquired 50.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
          50.00%us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeIncludingSubsequentAcquisitionPercentage
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
       
Investee's intangible assets for trade name 111,000,000seb_EquityMethodInvestmentSummarizedFinancialInformationIntangibleAssetsTradeName
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
          111,000,000seb_EquityMethodInvestmentSummarizedFinancialInformationIntangibleAssetsTradeName
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
       
Investee's intangible assets for goodwill 73,667,000seb_EquityMethodInvestmentSummarizedFinancialInformationGoodwill
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
          73,667,000seb_EquityMethodInvestmentSummarizedFinancialInformationGoodwill
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
       
Loan provided to affiliate         81,231,000seb_LoanProvidedToEquityMethodInvesteeOriginalPrincipalAmount
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
           
Butterball, LLC | Subordinated loan                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Loan provided to affiliate               100,000,000seb_LoanProvidedToEquityMethodInvesteeOriginalPrincipalAmount
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
     
Maturity period of unsecured subordinated loan provided               7 years      
Interest rate on loan provided (as a percent)               15.00%seb_LoansReceivableInterestRate
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
     
Percentage of interest payable in cash               5.00%seb_LoansReceivableInterestRatePayableInCash
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
     
Percentage of pay-in-kind interest               10.00%seb_LoansReceivableInterestRatePayableInKind
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
     
Notes receivable from affiliates 141,260,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
    126,082,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
    141,260,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
89,414,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentAxis
= us-gaap_SubordinatedDebtMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
     
Butterball, LLC | Detachable warrants                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Additional equity interest that can be acquired upon exercise of warrants (as a percent) 5.00%seb_EquityMethodInvestmentWarrantsAdditionalEquityInterestThatCanBeAcquired
/ invest_InvestmentAxis
= us-gaap_WarrantMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
          5.00%seb_EquityMethodInvestmentWarrantsAdditionalEquityInterestThatCanBeAcquired
/ invest_InvestmentAxis
= us-gaap_WarrantMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
       
Economic interest (as a percent) 52.50%seb_EquityMethodInvestmentEconomicInterest
/ invest_InvestmentAxis
= us-gaap_WarrantMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
          52.50%seb_EquityMethodInvestmentEconomicInterest
/ invest_InvestmentAxis
= us-gaap_WarrantMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
       
Investments in and advances to affiliates               10,586,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentAxis
= us-gaap_WarrantMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
     
Butterball, LLC | Term loan                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Loan provided to affiliate                 13,037,000seb_LoanProvidedToEquityMethodInvesteeOriginalPrincipalAmount
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
   
Interest rate on loan provided (as a percent) 12.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
          12.00%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
       
Notes receivable from affiliates 7,606,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
    8,905,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
    7,606,000us-gaap_NotesReceivableRelatedPartiesNoncurrent
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_ButterballLLCMember
       
Flour production business | Brazil                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership           50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
      50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
 
Investments in and advances to affiliates           17,000,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
      17,000,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
 
Flour production business | Brazil | Term loan                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Loan provided to affiliate                   13,000,000seb_LoanProvidedToEquityMethodInvesteeOriginalPrincipalAmount
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
 
Investments in and advances to affiliates 11,669,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
          11,669,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
       
Receivable from affiliate 13,849,000us-gaap_NotesReceivableRelatedPartiesCurrent
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
          13,849,000us-gaap_NotesReceivableRelatedPartiesCurrent
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
       
Period after which loan provided to affiliates can be repaid                   1 year  
Period after which loan provided to affiliates can be converted into equity                   1 year  
Receivables due from affiliates 13,969,000us-gaap_DueFromRelatedPartiesCurrent
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
          13,969,000us-gaap_DueFromRelatedPartiesCurrent
/ invest_InvestmentAxis
= us-gaap_LoansReceivableMember
/ invest_InvestmentGeographicRegionAxis
= country_BR
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourProductionBusinessMember
       
Flour milling business | Gambia                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership                     50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_GM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourMillingBusinessMember
Investments in and advances to affiliates                     9,099,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_GM
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourMillingBusinessMember
Flour milling business | South Africa                      
Investments in and Advances to Affiliates and Notes Receivable from Affiliates                      
Percentage of ownership           49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourMillingBusinessMember
      49.00%us-gaap_EquityMethodInvestmentOwnershipPercentage
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourMillingBusinessMember
 
Investments in and advances to affiliates           $ 7,351,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourMillingBusinessMember
      $ 7,351,000us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
/ invest_InvestmentGeographicRegionAxis
= country_ZA
/ us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis
= seb_FlourMillingBusinessMember