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Accounting Policies and Basis of Presentation (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2014 | Jun. 29, 2013 | Jun. 28, 2014 affiliate | Jun. 29, 2013
Supplemental Non-Cash Transactions |  |  |  |
Number of affiliates |  |  | 1 |
Non-cash, pay-in-kind interest income and accretion of discount recognized on a note receivable from an affiliate | $ 3,907 | $ 3,320 | $ 7,535 | $ 6,431

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- Definition Represents information pertaining to number of affiliates. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Interest received other than in cash for example on a note receivable from an affiliate. As a noncash item, it is subtracted from net income when calculating cash provided by or used in operations using the indirect method. + References No definition available. + Details
Name: | seb_PaidInKindInterestIncome
Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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