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Investments (Details) (USD $) In Thousands, unless otherwise specified | Apr. 04, 2015 | Dec. 31, 2014
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Investments |  |
Total short term investments, amortized cost | $ 598,730 seb_ShortTermInvestmentsAtAmortizedCost | $ 497,230 seb_ShortTermInvestmentsAtAmortizedCost
Total short term investments, fair value | 597,619 us-gaap_ShortTermInvestments | 490,566 us-gaap_ShortTermInvestments
Estimated fair value of fixed rate securities designated as available-for-sale, classified by the contractual maturity date of the security |  |
Due within one year | 984 us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue |
Due after one year through three years | 11,077 seb_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughThreeYearsFairValue |
Due after three years | 12,093 seb_AvailableForSaleSecuritiesDebtMaturitiesAfterThreeYearsFairValue |
Total fixed rate securities | 24,154 us-gaap_AvailableForSaleSecuritiesDebtSecurities |
Available-for-sale securities. |  |
Investments |  |
Amortized Cost | 263,243 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_AvailableforsaleSecuritiesMember | 167,049 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_AvailableforsaleSecuritiesMember
Fair Value | 263,451 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_AvailableforsaleSecuritiesMember | 167,096 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_AvailableforsaleSecuritiesMember
Money market funds |  |
Investments |  |
Amortized Cost | 236,974 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_MoneyMarketFundsMember | 142,432 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_MoneyMarketFundsMember
Fair Value | 236,974 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_MoneyMarketFundsMember | 142,432 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_MoneyMarketFundsMember
Corporate bonds |  |
Investments |  |
Amortized Cost | 11,652 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CorporateBondSecuritiesMember | 11,000 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CorporateBondSecuritiesMember
Fair Value | 11,757 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_CorporateBondSecuritiesMember | 11,015 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_CorporateBondSecuritiesMember
U.S. Government agency securities |  |
Investments |  |
Amortized Cost | 9,287 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 9,684 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value | 9,354 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember | 9,666 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Asset backed debt securities |  |
Investments |  |
Amortized Cost | 2,521 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_AssetBackedSecuritiesMember | 2,260 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_AssetBackedSecuritiesMember
Fair Value | 2,554 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_AssetBackedSecuritiesMember | 2,291 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_AssetBackedSecuritiesMember
U.S. Treasury securities |  |
Investments |  |
Amortized Cost | 1,990 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember | 523 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember
Fair Value | 1,996 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember | 522 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_USTreasurySecuritiesMember
Collateralized mortgage obligations |  |
Investments |  |
Amortized Cost | 819 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CollateralizedMortgageObligationsMember | 1,150 us-gaap_AvailableForSaleSecuritiesAmortizedCost / invest_InvestmentAxis = us-gaap_CollateralizedMortgageObligationsMember
Fair Value | 816 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_CollateralizedMortgageObligationsMember | 1,170 us-gaap_AvailableForSaleSecurities / invest_InvestmentAxis = us-gaap_CollateralizedMortgageObligationsMember
Trading securities. |  |
Investments |  |
Amortized Cost | 335,487 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = us-gaap_TradingAccountAssetsMember | 330,181 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = us-gaap_TradingAccountAssetsMember
Fair Value | 334,168 us-gaap_TradingSecurities / invest_InvestmentAxis = us-gaap_TradingAccountAssetsMember | 323,470 us-gaap_TradingSecurities / invest_InvestmentAxis = us-gaap_TradingAccountAssetsMember
High yield debt securities |  |
Investments |  |
Amortized Cost | 178,466 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_HighYieldTradingDebtSecuritiesMember | 187,491 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_HighYieldTradingDebtSecuritiesMember
Fair Value | 175,390 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_HighYieldTradingDebtSecuritiesMember | 181,483 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_HighYieldTradingDebtSecuritiesMember
Equity mutual fund |  |
Investments |  |
Amortized Cost | 86,309 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_EquityMutualFundsMember | 83,809 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_EquityMutualFundsMember
Fair Value | 86,268 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_EquityMutualFundsMember | 82,542 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_EquityMutualFundsMember
Domestic equity ETF |  |
Investments |  |
Amortized Cost | 59,157 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = us-gaap_ExchangeTradedFundsMember | 31,307 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = us-gaap_ExchangeTradedFundsMember
Fair Value | 61,806 us-gaap_TradingSecurities / invest_InvestmentAxis = us-gaap_ExchangeTradedFundsMember | 32,651 us-gaap_TradingSecurities / invest_InvestmentAxis = us-gaap_ExchangeTradedFundsMember
Money market funds held in trading accounts |  |
Investments |  |
Amortized Cost | 6,362 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_MoneyMarketFundsHeldInTradingAccountsMember | 21,401 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_MoneyMarketFundsHeldInTradingAccountsMember
Fair Value | 6,362 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_MoneyMarketFundsHeldInTradingAccountsMember | 21,401 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_MoneyMarketFundsHeldInTradingAccountsMember
Emerging markets trading debt mutual fund |  |
Investments |  |
Amortized Cost | 3,323 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_EmergingMarketsTradingDebtMutualFundsMember | 3,323 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_EmergingMarketsTradingDebtMutualFundsMember
Fair Value | 2,550 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_EmergingMarketsTradingDebtMutualFundsMember | 2,614 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_EmergingMarketsTradingDebtMutualFundsMember
Other trading investments |  |
Investments |  |
Amortized Cost | 1,870 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_OtherTradingInvestmentsMember | 2,850 us-gaap_TradingSecuritiesCost / invest_InvestmentAxis = seb_OtherTradingInvestmentsMember
Fair Value | 1,792 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_OtherTradingInvestmentsMember | 2,779 us-gaap_TradingSecurities / invest_InvestmentAxis = seb_OtherTradingInvestmentsMember
Denominated in Canadian dollars | Money market funds |  |
Investments |  |
Fair Value | 2,849 us-gaap_AvailableForSaleSecurities / us-gaap_CurrencyAxis = currency_CAD / invest_InvestmentAxis = us-gaap_MoneyMarketFundsMember |
Denominated in Euros | Money market funds |  |
Investments |  |
Fair Value | $ 13,132 us-gaap_AvailableForSaleSecurities / us-gaap_CurrencyAxis = currency_EUR / invest_InvestmentAxis = us-gaap_MoneyMarketFundsMember |

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- Definition Represents the fair value of debt securities which are expected to mature after one year and through three years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities. + References No definition available. + Details
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- Definition Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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