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SUBSEQUENT EVENTS Definitive Merger Agreement (Details) (Subsequent Event [Member], Shuanghui Merger [Member], USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Apr. 28, 2013
Subsequent Event [Member] | Shuanghui Merger [Member] |
Subsequent Event [Line Items] |
Merger Agreement, Per Share Price of Company's Common Stock | $ 34.00
Merger Agreement, Company's Normal Termination Fee | $ 175.0
Merger Agreement, Qualified Pre-existing Bidder Termination Fee | 75.0
Merger Agreement, Counterparty Termination Fee | $ 275.0

X
- Definition The fee that must be paid by the company to terminate the merger agreement in all but certain circumstances involving alternate pre-qualified existing bidders. + References No definition available. + Details
Name: | sfd_MergerAgreementCompanysNormalTerminationFee
Namespace Prefix: | sfd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The fee to be paid by the counterparty to the company if the merger agreement is terminated. + References No definition available. + Details
Name: | sfd_MergerAgreementCounterpartyTerminationFee
Namespace Prefix: | sfd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The per share price to be paid under the merger agreement to acquire the Company's outstanding common stock. + References No definition available. + Details
Name: | sfd_MergerAgreementPerSharePriceOfCompanysCommonStock
Namespace Prefix: | sfd_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The fee that must be paid by the company if the merger agreement is terminated due to an alternate agreement wiht a qualified pre-existing bidder. + References No definition available. + Details
Name: | sfd_MergerAgreementQualifiedPreExistingBidderTerminationFee
Namespace Prefix: | sfd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration