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Schedule of Actuarial Gain/(loss) on Defined Benefit Obligations (Parenthetical) (Detail)	12 Months Ended
	Jan. 02, 2021	Dec. 28, 2019
Compensation And Retirement Disclosure [Abstract]
defined benefit plan obligations, interest rate basis points	60.00%	90.00%

X

- Definition

Defined benefit plan obligations, interest rate basis points

+ References

No definition available.

+ Details

Name:	flo_DefinedBenefitPlanObligationsInterestRateBasisPoints
Namespace Prefix:	flo_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- References

No definition available.

+ Details

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