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Income Taxes (Details) (USD $) | Mar. 30, 2013
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Income Taxes |
One-time tax benefit on enactment of law | $ 7,945,000
One-time Federal blender's credits recognized as revenue | $ 11,260,000

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- Definition Represents the one-time Federal blender's credits recognized as revenue. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Represents amount of the one-time tax benefit on enactment of law. + References No definition available. + Details
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Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration