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Income Taxes (Details) $ in Millions | 9 Months Ended
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Sep. 28, 2019 USD ($)
Income Taxes |
Anticipated tax expense associated with the global intangible low-taxed income ("GILTI") provision of the 2017 Tax Act | $ 3
Anticipated tax expense associated with the base-erosion and anti-abuse tax ("BEAT") provision of the 2017 Tax Act | $ 0

X
- Definition Amount of anticipated tax expense associated with the base-erosion and anti-abuse tax ("BEAT") provision of the 2017 Tax Act. + References No definition available. + Details
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Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of anticipated tax expense associated with the global intangible low-taxed income ("GILTI") provision of the 2017 Tax Act. + References No definition available. + Details
Name: | seb_AnticipatedTaxExpenseAssociatedWithGlobalIntangibleLowTaxedIncomeProvision
Namespace Prefix: | seb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration