1001 - Document - Cover link:presentationLink link:definitionLink link:calculationLink 1002 - Statement - Statements of Net Assets Available for Benefits link:presentationLink link:definitionLink link:calculationLink 1003 - Statement - Statement of Changes in Net Assets Available for Benefits link:presentationLink link:definitionLink link:calculationLink 1004 - Disclosure - Description of the Plan link:presentationLink link:definitionLink link:calculationLink 1005 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:definitionLink link:calculationLink 1006 - Disclosure - Recent Accounting Pronouncements link:presentationLink link:definitionLink link:calculationLink 1007 - Disclosure - Investment in Flowers Foods, Inc. Common Stock Fund link:presentationLink link:definitionLink link:calculationLink 1008 - Disclosure - Fair Value Measurements link:presentationLink link:definitionLink link:calculationLink 1009 - Disclosure - Related Party and Party-in-Interest Transactions link:presentationLink link:definitionLink link:calculationLink 1010 - Disclosure - Plan Termination link:presentationLink link:definitionLink link:calculationLink 1011 - Disclosure - Forfeitures link:presentationLink link:definitionLink link:calculationLink 1012 - Disclosure - Tax Status link:presentationLink link:definitionLink link:calculationLink 1013 - Disclosure - Risks and Uncertainties link:presentationLink link:definitionLink link:calculationLink 1014 - Disclosure - Subsequent Events link:presentationLink link:definitionLink link:calculationLink 1015 - Disclosure - Schedule of Assets (Held at End of Year) link:presentationLink link:definitionLink link:calculationLink 1016 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:definitionLink link:calculationLink 1017 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:definitionLink link:calculationLink 1018 - Disclosure - Schedule of Assets (Held at End of Year) (Tables) link:presentationLink link:definitionLink link:calculationLink 1019 - Disclosure - Description of the Plan - Additional information (Detail) link:presentationLink link:definitionLink link:calculationLink 1020 - Disclosure - Investment in Flowers Foods, Inc. Common Stock Fund - Schedule of Plan Held Investments in The Company (Detail) link:presentationLink link:definitionLink link:calculationLink 1021 - Disclosure - Investment in Flowers Foods, Inc. Common Stock Fund - Schedule of Plan Held Investments in The Company (Parenthetical) (Detail) link:presentationLink link:definitionLink link:calculationLink 1022 - Disclosure - Investment in Flowers Foods, Inc. Common Stock Fund - Additional information (Detail) link:presentationLink link:definitionLink link:calculationLink 1023 - Disclosure - Fair Value Measurements - Summary of Employee Benefit Plan Investment in Plan Assets (Detail) link:presentationLink link:definitionLink link:calculationLink 1024 - Disclosure - Fair Value Measurements - Summary of Investments Measured at Fair Value Based on NAV (Detail) link:presentationLink link:definitionLink link:calculationLink 1025 - Disclosure - Related Party and Party-in-Interest Transactions - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1026 - Disclosure - Forfeitures - Additonal information (Detail) link:presentationLink link:definitionLink link:calculationLink 1027 - Disclosure - Tax Status - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1028 - Disclosure - Subsequent Events - Additional Information (Detail) link:presentationLink link:definitionLink link:calculationLink 1029 - Disclosure - Schedule of Assets (Held at End of Year) - Summary of Employee Benefit Plan Statement of Investment (Detail) link:presentationLink link:definitionLink link:calculationLink 1030 - Disclosure - Schedule of Assets (Held at End of Year) - Summary of Employee Benefit Plan Statement of Investment (Detail) Alternate link:presentationLink link:definitionLink link:calculationLink Cover [Abstract] Document Information [Table] Document Information [Line Items] Document Type Current Fiscal Year End Date Document Fiscal Year Focus Entity Registrant Name Document Fiscal Period Focus Amendment Flag Document Period End Date Entity Central Index Key Legal Entity [Axis] Entity [Domain] EBP 004 [Member] Employee Benefit Plan, Statement of Net Asset Available for Benefit [Abstract] Statement of Net Assets Employee Benefit Plan, Statement of Net Asset Available for Benefit [Table] Investment Type [Axis] Investments [Domain] Common Collective Trust [Member] Collective investment trust funds [Member] Common Collective Trust [Member] Mutual Fund [Member] Mutual funds [Member] Employee Benefit Plan, Employer, Common Stock Fund [Member] Flowers Foods, Inc. Common Stock Fund [Member] Employee Benefit Plan, Statement of Net Asset Available for Benefit [Line Items] Employee Benefit Plan, Asset [Abstract] Assets Employee Benefit Plan, Investment, Fair Value [Abstract] Investments, at fair value Employee Benefit Plan, Investment, Excluding Plan Interest in Master Trust, Fair Value Employee benefit plan, investment, fair value, total Investments at fair value Fair Value Employee Benefit Plan, Receivable [Abstract] Receivables Employee Benefit Plan, Employer Contribution Receivable Employer contributions Employee Benefit Plan, Participant Contribution Receivable Participant contributions Employee Benefit Plan, Note Receivable from Participant Notes receivable from participants Employee Benefit Plan, Receivable, Total Total receivables Employee Benefit Plan, Net Asset Available for Benefit, Total Net assets available for benefits Beginning of year End of year Employee Benefit Plan, Statement of Change in Net Asset Available for Benefit [Abstract] Employee Benefit Plan, Statement of Change in Net Asset Available for Benefit [Table] Employee Benefit Plan, Statement of Change in Net Asset Available for Benefit [Line Items] Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Additions to net assets attributed to Investment income: Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Dividends Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment Interest Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment, Total Net appreciation in fair value of investments Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment, Total Total investment income Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Interest Income on Note Receivable from Participant Interest income on notes receivable from participants Contributions: Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Employer Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Excluding Rollover Participants Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Participant Contribution, Rollover Rollovers Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase from Contribution, Total Total contributions Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase, Total Total additions Employee Benefit Plan, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Benefit payments EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense Administrative expenses Employee benefit plan, change in net asset available for benefit, decrease from administrative expense Employee benefit plan, change in net asset available for benefit, decrease for management fee expense Employee Benefit Plan, Change in Net Asset Available for Benefit, Decrease, Total Total deductions Employee Benefit Plan, Change in Net Asset Available for Benefit, Increase (Decrease), Total Net increase in net assets Employee Benefit Plan, Description of Plan [Abstract] EBP, Description of Plan and Accounting Change [Abstract] Employee Benefit Plan, Description of Plan [Table] Employee Benefit Plan, Description of Plan [Line Items] Employee Benefit Plan, Description of Plan [Text Block] Description of the Plan Employee Benefit Plan, Accounting Policy [Abstract] Employee Benefit Plan, Summary of Accounting Policy [Text Block] Summary of Significant Accounting Policies Employee Benefit Plan Recent Accounting Pronouncements [Abstract] Employee benefit plan recent accounting pronouncements. Employee Benefit Plan Recent Accounting Pronouncements [Text Block] Recent Accounting Pronouncements Employee benefit plan recent accounting pronouncements. Employee Benefit Plan, Schedule of Asset Held for Investment [Abstract] Employee Benefit Plan, Schedule of Asset Held for Investment [Table] Employee Benefit Plan Schedule of Asset Held for Investment [Text Block] Investment in Flowers Foods, Inc. Common Stock Fund Employee benefit plan schedule of asset held for investment. Employee Benefit Plan, Investment, Fair Value and NAV [Abstract] Employee Benefit Plan, Investment, Fair Value and NAV [Table] Employee Benefit Plan, Investment, Fair Value and NAV [Line Items] Employee Benefit Plan, Investment, Fair Value and NAV [Text Block] Fair Value Measurements Employee Benefit Plan, Related Party and Party-in-Interest Transactions [Abstract] Employee Benefit Plan, Related Party and Party-in-Interest Transactions [Table] Employee Benefit Plan, Related Party and Party-in-Interest Transactions [Line Items] Employee Benefit Plan, Related Party and Party-in-Interest Transactions [Text Block] Related Party and Party-in-Interest Transactions Employee Benefit Plan Plan Termination [Abstract] Employee Benefit Plan Plan Termination [Table] Employee Benefit Plan Plan Termination [Line Items] Employee Benefit Plan, Plan Termination [Text Block] Plan Termination Employee Benefit Plan, Forfeited Nonvested Account [Abstract] Employee Benefit Plan Forfeitures Non Invested Account [Text Block] Forfeitures Employee benefit plan forfeitures non invested account. Employee Benefit Plan, Tax Status [Abstract] Employee Benefit Plan, Tax Status [Table] Employee Benefit Plan, Tax Status [Line Items] Employee Benefit Plan, Tax Status [Text Block] Tax Status Employee Benefit Plan Risk and Uncertainty [Abstract] Employee Benefit Plan Risk and Uncertainty [Table] Employee Benefit Plan Risk and Uncertainty [Line Items] Employee Benefit Plan, Risk and Uncertainty [Text Block] Risks and Uncertainties Employee Benefit Plan Subsequent Event [Abstract] Employee Benefit Plan Subsequent Event [Table] Employee Benefit Plan Subsequent Event [Line Items] Employee Benefit Plan, Subsequent Event [Text Block] Subsequent Events Employee Benefit Plan, Schedule of Asset Held for Investment [Line Items] Employee Benefit Plan Schedule of Asset Held for Investments [Text Block] Schedule of Assets (Held at End of Year) Employee benefit plan schedule of asset held for investments. Employee Benefit Plan, Basis of Accounting [Policy Text Block] Basis of Accounting Employee Benefit Plan, Investment [Policy Text Block] Investment Valuation and Income Recognition Employee Benefit Plan, Purchase of Insurance Contract, Excluded from Plan Asset [Policy Text Block] The Plan invests in investment contracts through a collective trust. Employee Benefit Plan, Note Receivable from Participant [Policy Text Block] Notes Receivable from Participants Employee Benefit Plan, Contribution [Policy Text Block] Contributions Employee Benefit Plan, Use of Estimate [Policy Text Block] Use of Estimates Employee Benefit Plan, Payment to Participant [Policy Text Block] Payment of Benefits Employee Benefit Plan Investment In Plan Assets [Table Text Block] Summary of Employee Benefit Plan Investment in Plan Assets Employee benefit plan investment in plan assets. Employee Benefit Plan, Investment, Fair Value and NAV [Table Text Block] Summary of Investments Measured at Fair Value Based on NAV Employee Benefit Plan, Schedule of Asset Held for Investment [Table Text Block] Summary of Employee Benefit Plan Statement of Investment Employee Benefit Plan, Change in Net Asset Available for Benefit, Transfer to (from) External Plan Plan merger Description of Eligibility for Participation of the Plan Description of eligibility for participation of the plan Description of eligibility for participation of the plan. Employee Benefit Plan, Employer Contribution, Participant Compensation Matched, Percentage Employer contribution, percentage EBP, Participant Contribution, Pretax, Maximum Annual Compensation, Amount Employee benefit plan, participant contribution, pretax, maximum annual compensation, amount EBP, participant contribution, pretax, maximum annual compensation, amount Employee Benefit Plan, Note Receivable from Participant, Account, Minimum Borrowing, Amount Employee benefit plan, note receivable from participant, account, minimum borrowing, amount Employee Benefit Plan, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage Employee benefit plan, note receivable from participant, account, maximum borrowing, to total account, percentage Employee Benefit Plan Administrative Fee Per Year Employee benefit plan administrative fee per year Employee benefit plan administrative fee per year. Employee Benefit Plan Participant Contribution Year Age Employee benefit plan participant contribution year age Employee benefit plan participant contribution year age. Employee Benefit Plan, Employer Contribution, Matching Percentage Employee benefit plan, employer contribution, matching percentage Employee Benefit Plan, Participant Contribution, Pretax, Maximum Annual Compensation to Total Compensation, Percentage Employee benefit plan, participant contribution, pretax, maximum annual compensation to total compensation, percentage Employee Benefit Plan Employer Contribution for Payroll Matching Percentage Employee benefit plan employer contribution for payroll matching percentage Employee benefit plan employer contribution for payroll matching percentage. Employee Benefit Plan Participant Catch Up Contribution Employee benefit plan participant catch up contribution Employee benefit plan participant catch up contribution. Employee Benefit Plan Employer Contribution Vesting Period Employee benefit plan employer contribution vesting period Employee benefit plan employer contribution vesting period. Employee Benefit Plan Service Of Matching Contribution Vesting Period Employee benefit plan service of matching contribution vesting period Employee benefit plan service of matching contribution vesting period. Employee Benefit Plan Contribution of Vesting Period Retirement Age Employee benefit plan contribution of vesting period retirement age Employee benefit plan contribution of vesting period retirement age. Employee Benefit Plan Note Receivable From Participant Account Loan Period Employee benefit plan note receivable from participant account loan period Employee benefit plan note receivable from participant account loan period. Employee Benefit Plan Note Receivable From Participant Account For Applicable Rate Of Loan Issued Employee benefit plan note receivable from participant account for applicable rate of loan issued Employee benefit plan note receivable from participant account for applicable rate of loan issued. Employee Benefit Plan Distrubution Of Benefit Vesting Balance Employee benefit plan distrubution of benefit vesting balance Employee benefit plan distrubution of benefit vesting balance. Employee Benefit Plan Distrubution Of Benefit Vesting Balance Required Minimum Age Employee benefit plan distrubution of benefit vesting balance required minimum age Employee benefit plan distrubution of benefit vesting balance required minimum age. Employee Benefit Plan, Note Receivable from Participant, Account, Maximum Borrowing, Amount Employee benefit plan, note receivable from participant, account, maximum borrowing, amount Participant Loans Maturity Range Start Date Participant loans maturity range start date Participant loans maturity range start date. Participant Loans Maturity Range End Date Participant loans maturity range end date Participant loans maturity range end date. Statistical Measurement [Axis] Statistical Measurement [Domain] Maximum [Member] Minimum [Member] EBP, Employer, Common Stock [Member] Common Stock Fund [Member] Common stock fund. Employee Benefit Plan, Investment, Number of Shares Number of common shares held Employee benefit plan, investment, number of shares Employee Benefit Plan, Investment, Fair Value, Total Fair value of common shares held (at $10.88 and $20.66 per common share, respectively) Employee Benefit Plan Common Shares as Percentage of Total Investment Fair Value Common shares as a percentage of the Plan's total investments at fair value Employee benefit plan common shares as percentage of total investment fair value. Employee Benefit Plan Common Shares as Percentage Common shares as a percentage of Flowers Foods, Inc. Employee benefit plan common shares as percentage. Employee Benefit Plan Short Term Investment Fund Short term investment fund Employee benefit plan short term investment fund. Employee Benefit Plan Investment Per Common Share Employee benefit plan investment per common share. Employee Benefit Plan, Net Asset Value per Share or Unit Employee benefit plan, net asset value per share or unit Employee Benefit Plan Investment In Plan Assets [Abstract] Employee Benefit Plan Investment In Plan Assets [Table] Employee Benefit Plan Investment In Plan Assets [Line Items] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Domain] Fair Value, Inputs, Level 1 [Member] Level 1 [Member] Employee Benefit Plan Fair Value Investments Entities that Calculate Net Asset Value Per Share Unfunded Committments Unfunded Commitments Employee benefit plan fair value investments entities that calculate net asset value per share unfunded committments. Employee benefit Plan Fair Value Investments Entities that Calculate Net Asset Value Per Share Investment Redemption Frequency Redemption Frequency Employee benefit plan fair value investments entities that calculate net asset value per share investmentredemption frequency. Employee Benefit Plan Fair Value Investments Entities that Calculate Net Asset Value Per Share Investment Redemption Notice Period Redemption Notice Period Employee benefit plan fair value investments entities that calculate net asset value per share investment redemption notice period. Investment Type Name [Axis] Investment Type Name [Domain] Putnam Stable Value Fund [Member] Geneva Small Cap Growth Collective Fund C [Member] Harbor Capital Appreciation CIT 4 [Member] Harbor Capital Appreciation CIT R [Member] Vanguard Target Retirement 2020 Trust II [Member] Vanguard Target Retirement 2025 Trust II [Member] Vanguard Target Retirement 2030 Trust II [Member] Vanguard Target Retirement 2035 Trust II [Member] Vanguard Target Retirement 2040 Trust II [Member] Vanguard Target Retirement 2045 Trust II [Member] Vanguard Target Retirement 2060 Trust II [Member] Vanguard Target Retirement Inc Trust II [Member] Vanguard Target Retirement 2070 Trust II [Member] Vanguard Target Retirement 2050 Trust II [Member] Vanguard Target Retirement 2055 Trust II [Member] Vanguard Target Retirement 2065 Trust II [Member] Employee Benefit Plan Investment Value of Shares Purchased Employee benefit plan investment value of shares purchased Employee benefit plan investment value of shares purchased. Employee Benefit Plan Investment Value of Shares Sold Employee benefit plan investment value of shares sold Employee benefit plan investment value of shares sold. Employee Benefit Plan Interests In Master Trust Dividends Received Employee benefit plan interests in master trust dividends received Employee benefit plan interests in master trust dividends received. Employee Benefit Plan, Related Party and Party-in-Interest [Axis] Employee Benefit Plan, Related Party and Party-in-Interest [Domain] Employee Benefit Plan, Trustee [Member] Employee Benefit Plan, Forfeited Nonvested Account Employee benefit plan, forfeited nonvested account Employee Benefit Plan, Forfeited Nonvested Account, Decrease from Employer Contribution Employee benefit plan, forfeited nonvested account, decrease from employer contribution Employee Benefit Plan, Tax Determination Letter, Date Employee benefit plan, tax determination letter, date Roth catch up contribution income threshold amount Roth catch up contribution income threshold amount Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event [Member] Participant Age Category [Axis] Participant Age Category [Domain] Age Fifty [Member] Age Sixty [Member] Age Sixty Three [Member]