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EQUITY Call Spread Transactions (Details) (USD $)
In Millions, except Share data, unless otherwise specified
1 Months Ended 3 Months Ended 5 Months Ended
Jul. 31, 2008
Dec. 29, 2013
Sep. 26, 2013
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 30.54us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 17,600,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights    
Proceeds from Issuance of Warrants $ 36.7us-gaap_ProceedsFromIssuanceOfWarrants    
Payments for Repurchase of Warrants   79.4us-gaap_PaymentsForRepurchaseOfWarrants  
Purchased Call Option      
Option Indexed to Issuer's Equity, Indexed Shares 17,600,000us-gaap_OptionIndexedToIssuersEquityIndexedShares
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
   
Option Indexed to Issuer's Equity, Strike Price $ 22.68us-gaap_OptionIndexedToIssuersEquityStrikePrice1
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
   
Purchase of Call Options 88.2sfd_PurchaseOfCallOptions
/ us-gaap_OptionIndexedToIssuersEquityEquityAxis
= us-gaap_CallOptionMember
   
Senior Unsecured Convertible Notes, Four Percent, Due June 2013      
Stock Repurchased and Retired During Period, Shares     34us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_DebtInstrumentAxis
= sfd_SeniorUnsecuredConvertibleNotesFourPercentDueJune2013Member
Repayments of Long-term Debt     $ 400.0us-gaap_RepaymentsOfLongTermDebt
/ us-gaap_DebtInstrumentAxis
= sfd_SeniorUnsecuredConvertibleNotesFourPercentDueJune2013Member
Stock Issued During Period, Shares, Conversion of Convertible Securities     3,894,476us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_DebtInstrumentAxis
= sfd_SeniorUnsecuredConvertibleNotesFourPercentDueJune2013Member
Net Shares Retired, Settlement of Convertible Notes     3,894,510sfd_NetSharesRetiredSettlementofConvertibleNotes
/ us-gaap_DebtInstrumentAxis
= sfd_SeniorUnsecuredConvertibleNotesFourPercentDueJune2013Member