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Notes Receivable from IDPs - Additional Information (Detail)	12 Months Ended
	Jan. 02, 2021
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing period of distribution rights, years	10 years

X

- Definition

Represents the term in years for distributor notes receivable

+ References

No definition available.

+ Details

Name:	flo_FinancingPeriodOfDistributorNotesReceivable
Namespace Prefix:	flo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: