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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 |
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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 | $ 523,063,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  | $ 406,900,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  | $ 523,063,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures |  |  |  |
Notes receivable from affiliates | 197,270,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent |  |  | 180,386,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent |  |  | 197,270,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent |  |  |  |
Proceeds from the sale of controlling interest in a subsidiary | 74,142,000 us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates |  |  |  |  |  |  |  |  |  |
Gain on sale of controlling interest in subsidiary | 65,955,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary |  |  |  |  |  |  |  |  |  |
Additional investment or capital contribution | 3,886,000 seb_EquityMethodInvestmentAdditionalInvestment |  |  |  |  |  |  |  |  |  |
Receivables due from affiliates | 201,870,000 us-gaap_DueFromRelatedPartiesCurrent |  |  | 145,041,000 us-gaap_DueFromRelatedPartiesCurrent |  |  | 201,870,000 us-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 |  | 74,142,000 us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember |  |  |  |  |  |  |  |  |
Gain on sale of controlling interest in subsidiary |  | 65,955,000 us-gaap_GainOrLossOnSaleOfStockInSubsidiary / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember |  |  |  |  |  |  |  |  |
Number of processing plants |  | 2 seb_NumberOfProcessingPlants / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember | 2 seb_NumberOfProcessingPlants / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember |  |  |  |  |  |  |  |
Decrease (increase) in investments in and advances to affiliates |  | 74,142,000 seb_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 | 79,832,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  | 79,832,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |
Combined condensed financial information of the non-controlled, non-consolidated affiliates |  |  |  |  |  |  |  |  |  |  |
Net sales | 71,173,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  |  |  |  |  |
Net income (loss) | 7,381,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  |  |  |  |  |
Total assets | 175,055,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  | 175,055,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |
Total liabilities | 15,238,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  | 15,238,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |
Total equity | 159,817,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  | 159,817,000 us-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 |  |  | 32,978,000 seb_FairValueOfInvestmentsExceedingBookValue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  |  |  |
Fair value of investment |  | 74,142,000 seb_InvestmentOwnedAtFairValueBeforeAdditionalEquityContribution / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember | 74,142,000 seb_InvestmentOwnedAtFairValueBeforeAdditionalEquityContribution / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  |  |  |
Additional investment or capital contribution |  |  | 2,000,000 seb_EquityMethodInvestmentAdditionalInvestment / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  |  |  |
Beginning total investment in affiliate |  | 76,142,000 us-gaap_InvestmentOwnedAtFairValue / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember | 76,142,000 us-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 | 178,344,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  | 197,036,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  | 178,344,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |
Excess of carrying value of investment in affiliates over entity's share of affiliates' book value | 13,655,000 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |  |  | 13,655,000 us-gaap_EquityMethodInvestmentDifferenceBetweenCarryingAmountAndUnderlyingEquity / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |
Combined condensed financial information of the non-controlled, non-consolidated affiliates |  |  |  |  |  |  |  |  |  |  |
Net sales | 2,222,591,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  | 1,907,647,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember | 1,510,101,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |  |  |
Net income (loss) | (20,169,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  | 7,857,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember | 24,686,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |  |  |
Total assets | 1,132,120,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  | 1,038,978,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember | 862,992,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  | 1,132,120,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |
Total liabilities | 731,984,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  | 614,623,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember | 469,265,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  | 731,984,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  |  |
Total equity | 400,136,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  |  | 424,355,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember | 393,727,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_CommodityTradingAndMillingMember |  | 400,136,000 us-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 | 17,333,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember |  |  |  |  |  | 17,333,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember |  |  |  |
Combined condensed financial information of the non-controlled, non-consolidated affiliates |  |  |  |  |  |  |  |  |  |  |
Total assets | 118,823,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember |  |  |  |  |  | 118,823,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember |  |  |  |
Total liabilities | 36,379,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember |  |  |  |  |  | 36,379,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember |  |  |  |
Total equity | 82,444,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember |  |  |  |  |  | 82,444,000 us-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 | 2,994,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 2,768,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 2,994,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |  |
Combined condensed financial information of the non-controlled, non-consolidated affiliates |  |  |  |  |  |  |  |  |  |  |
Net sales | 9,191,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 12,073,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember | 12,107,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |  |  |  |
Net income (loss) | 1,684,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 1,349,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember | 194,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |  |  |  |
Total assets | 8,178,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 9,271,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember | 8,865,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  | 8,178,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |  |
Total liabilities | 1,660,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 3,158,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember | 2,839,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  | 1,660,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  |  |
Total equity | 6,518,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  |  | 6,113,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember | 6,026,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_SugarMember |  | 6,518,000 us-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 | 244,560,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  | 207,096,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  | 244,560,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  |  |
Combined condensed financial information of the non-controlled, non-consolidated affiliates |  |  |  |  |  |  |  |  |  |  |
Net sales | 1,833,141,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  | 1,729,568,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember | 1,437,376,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  |  |  |  |
Net income (loss) | 104,130,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  | (19,556,000)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember | 38,384,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  |  |  |  |
Total assets | 1,021,182,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  | 907,004,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember | 871,945,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  | 1,021,182,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationAssets / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  |  |
Total liabilities | 547,398,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  | 504,581,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember | 443,291,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  | 547,398,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationLiabilities / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  |  |
Total equity | 473,784,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  |  | 402,423,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember | 428,654,000 us-gaap_EquityMethodInvestmentSummarizedFinancialInformationEquity / us-gaap_StatementBusinessSegmentsAxis = seb_TurkeyMember |  | 473,784,000 us-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 |  |  | 74,142,000 us-gaap_ProceedsFromDivestitureOfInterestInSubsidiariesAndAffiliates / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = seb_DivestitureOfPortionOfDailysPremiumMeatsMember / dei_LegalEntityAxis = seb_TriumphFoodsLlcMember / us-gaap_StatementBusinessSegmentsAxis = seb_PorkSegmentMember |  |  |  |  |  |  |  |
Gain on sale of controlling interest in subsidiary |  |  | 65,955,000 us-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 |  |  | 40,233,000 seb_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) |  |  | $ 34.14 seb_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 | 57,390,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent / invest_InvestmentGeographicRegionAxis = country_CD |  |  |  |  |  | 57,390,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent / invest_InvestmentGeographicRegionAxis = country_CD |  |  |  |
Increase in long-term notes receivable from affiliates |  |  |  | 26,290,000 us-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 | 34,556,000 seb_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 |  |  |  | 26,290,000 seb_IncreaseDecreaseInNotesReceivableFromAffiliatesNoncurrent / invest_InvestmentGeographicRegionAxis = country_CD / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_BakeryBusinessMember |  | 26,290,000 seb_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 |  |  |  |  |  |  | 10,772,000 us-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 | 2,595,000 seb_InvestmentsInEquityAndLongTermAdvances / invest_InvestmentGeographicRegionAxis = country_CD / dei_LegalEntityAxis = seb_SeaboardMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_BakeryBusinessMember |  |  | 4,531,000 seb_InvestmentsInEquityAndLongTermAdvances / invest_InvestmentGeographicRegionAxis = country_CD / dei_LegalEntityAxis = seb_SeaboardMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_BakeryBusinessMember | 24,814,000 seb_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 |  | 17,333,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / invest_InvestmentGeographicRegionAxis = country_JM / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_CargoTerminalBusinessMember / us-gaap_StatementBusinessSegmentsAxis = seb_MarineMember | 17,333,000 us-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 | 2 seb_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 | 111,000,000 seb_EquityMethodInvestmentSummarizedFinancialInformationIntangibleAssetsTradeName / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  |  |  |  | 111,000,000 seb_EquityMethodInvestmentSummarizedFinancialInformationIntangibleAssetsTradeName / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  |  |
Investee's intangible assets for goodwill | 73,667,000 seb_EquityMethodInvestmentSummarizedFinancialInformationGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  |  |  |  | 73,667,000 seb_EquityMethodInvestmentSummarizedFinancialInformationGoodwill / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  |  |
Loan provided to affiliate |  |  |  |  | 81,231,000 seb_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 |  |  |  |  |  |  |  | 100,000,000 seb_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 | 141,260,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent / invest_InvestmentAxis = us-gaap_SubordinatedDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  | 126,082,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent / invest_InvestmentAxis = us-gaap_SubordinatedDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  | 141,260,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent / invest_InvestmentAxis = us-gaap_SubordinatedDebtMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember | 89,414,000 us-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 |  |  |  |  |  |  |  | 10,586,000 us-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 |  |  |  |  |  |  |  |  | 13,037,000 seb_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 | 7,606,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent / invest_InvestmentAxis = us-gaap_LoansReceivableMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  | 8,905,000 us-gaap_NotesReceivableRelatedPartiesNoncurrent / invest_InvestmentAxis = us-gaap_LoansReceivableMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_ButterballLLCMember |  |  | 7,606,000 us-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 |  |  |  |  |  | 17,000,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / invest_InvestmentGeographicRegionAxis = country_BR / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourProductionBusinessMember |  |  |  | 17,000,000 us-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 |  |  |  |  |  |  |  |  |  | 13,000,000 seb_LoanProvidedToEquityMethodInvesteeOriginalPrincipalAmount / invest_InvestmentAxis = us-gaap_LoansReceivableMember / invest_InvestmentGeographicRegionAxis = country_BR / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourProductionBusinessMember |
Investments in and advances to affiliates | 11,669,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / invest_InvestmentAxis = us-gaap_LoansReceivableMember / invest_InvestmentGeographicRegionAxis = country_BR / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourProductionBusinessMember |  |  |  |  |  | 11,669,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / invest_InvestmentAxis = us-gaap_LoansReceivableMember / invest_InvestmentGeographicRegionAxis = country_BR / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourProductionBusinessMember |  |  |  |
Receivable from affiliate | 13,849,000 us-gaap_NotesReceivableRelatedPartiesCurrent / invest_InvestmentAxis = us-gaap_LoansReceivableMember / invest_InvestmentGeographicRegionAxis = country_BR / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourProductionBusinessMember |  |  |  |  |  | 13,849,000 us-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 | 13,969,000 us-gaap_DueFromRelatedPartiesCurrent / invest_InvestmentAxis = us-gaap_LoansReceivableMember / invest_InvestmentGeographicRegionAxis = country_BR / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourProductionBusinessMember |  |  |  |  |  | 13,969,000 us-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 |  |  |  |  |  |  |  |  |  |  | 9,099,000 us-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 |  |  |  |  |  | $ 7,351,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / invest_InvestmentGeographicRegionAxis = country_ZA / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourMillingBusinessMember |  |  |  | $ 7,351,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / invest_InvestmentGeographicRegionAxis = country_ZA / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = seb_FlourMillingBusinessMember |

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