Income Taxes (Details) $ in Millions	3 Months Ended
Jun. 29, 2019 USD ($)
Income Taxes
Anticipated tax expense associated with the global intangible low-taxed income ("GILTI") provision of the 2017 Tax Act	$ 1
Anticipated tax expense associated with the base-erosion and anti-abuse tax ("BEAT") provision of the 2017 Tax Act	$ 0

Amount of anticipated tax expense associated with the global intangible low-taxed income ("GILTI") provision of the 2017 Tax Act.

No definition available.

Name:	seb_AnticipatedTaxExpenseAssociatedWithGlobalIntangibleLowTaxedIncomeProvision
Namespace Prefix:	seb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration