Payout Percentage of Total Shareholder Return Shares (Detail) - Total Shareholders Return	12 Months Ended
Jan. 02, 2021
2016 Award \| Fiscal 2018
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]
Payout percentage	12.50%
2017 Award \| Fiscal 2019
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Equity Instruments Other Than Options Restricted Stock Units [Line Items]
Payout percentage	153.00%

Schedule of share based compensation arrangements by share based payment award, equity instruments, other than options, restricted stock units.

No definition available.

Name:	flo_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsRestrictedStockUnitsLineItems
Namespace Prefix:	flo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration