Maximum Maximum [Member] Employer Contribution Receivable [Text Block] Employer Contribution Receivable [Text Block] Employer Contribution Receivable Legal Entity [Axis] Legal Entity [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] EBP, Description of Plan [Table] EBP, Description of Plan [Table] Mutual Funds Mutual Fund [Member] Accrued excess contributions payable at end of year EBP, Reconciliation to Form 5500, Accrued Excess Contributions Payable at End of Year EBP, Reconciliation to Form 5500, Accrued Excess Contributions Payable at End of Year EBP, Employer Contribution Receivable [Abstract] EBP, Employer Contribution Receivable [Abstract] EBP, Employer Contribution Receivable EBP, Related Party and Party-in-Interest Transactions [Table] EBP, Related Party and Party-in-Interest Transactions [Table] General [Text Block] General [Text Block] General Total deductions EBP, Change in Net Asset Available for Benefit, Decrease EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount EBP, Note Receivable from Participant, Account, Maximum Borrowing, Amount Investments [Text Block] EBP, Investment, Fair Value and NAV [Text Block] EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount EBP, Note Receivable from Participant, Account, Minimum Borrowing, Amount Employer Contribution Matching Amount, Percentage of Eligible Annual Compensation, Maximum Employer Contribution Matching Amount, Percentage of Eligible Annual Compensation, Maximum Employer Contribution Matching Amount, Percentage of Eligible Annual Compensation, Maximum Investments, at fair value Total investments EBP, Investment, Excluding Plan Interest in Master Trust, Fair Value Distribution of Benefits [Policy Text Block] Distribution of Benefits [Policy Text Block] Distribution of Benefits Fair Value, Inputs, Level 1 Fair Value, Inputs, Level 1 [Member] EBP, Administration of the Plan [Line Items] Administration of the Plan [Line Items] Administration of the Plan Reconciliation of Financial Statements to Form 5500 [Table Text Block] EBP, Reconciliation of Financial Statement to Form 5500 [Table Text Block] EBP, Investment, Fair Value and NAV [Abstract] Total assets EBP, Asset Statistical Measurement [Axis] Statistical Measurement [Axis] Administration of the Plan [Table] Administration of the Plan [Table] Administration of the Plan Additions to net assets attributed to: [Abstract] EBP, Change in Net Asset Available for Benefit, Increase [Abstract] EBP, Statement of Change in Net Asset Available for Benefit [Table] EBP, Statement of Change in Net Asset Available for Benefit [Table] Participant Accounts [Policy Text Block] EBP, Payment to Participant [Policy Text Block] Total liabilities EBP, Liability Amendment Flag Amendment Flag Distributions of excess contributions per the Form 5500 EBP, Form 5500 Caption, Distributions of excess contributions EBP, Form 5500 Caption, Distributions of excess contributions Participant EBP, Change in Net Asset Available for Benefit, Increase from Participant Contribution Basis of Accounting [Policy Text Block] EBP, Basis of Accounting [Policy Text Block] EBP, Schedule of Asset Held for Investment [Table] EBP, Schedule of Asset Held for Investment [Table] Number of Units/Shares EBP, Investment, Number of Shares EBP, Description of Plan and Accounting Change [Abstract] Fair Value for Investments [Table Text Block] EBP, Investment, Fair Value and NAV [Table Text Block] Contributions: EBP, Contribution [Abstract] Publix Stock Common Stock [Member] Investments [Domain] Investments [Domain] Use of Estimates [Policy Text Block] EBP, Use of Estimate [Policy Text Block] EBP, Related Party and Party-in-Interest [Domain] EBP, Related Party and Party-in-Interest [Domain] EBP, Schedule of Asset Held for Investment [Text Block] EBP, Schedule of Asset Held for Investment [Text Block] EBP 001 EBP 001 [Member] EBP 001 Cover [Abstract] Amounts allocated to withdrawing participants at end of year EBP, Reconciliation to Form 5500, Net Asset Available for Benefit, Allocation to Withdrawing Participant, Not yet Paid Employer EBP, Change in Net Asset Available for Benefit, Increase from Employer Contribution, Cash Administration of the Plan [Text Block] Administration of the Plan [Text Block] Administration of the Plan Amounts allocated to withdrawing participants at beginning of year EBP, Reconciliation to Form 5500, Payment to Participant, Decrease from Allocation to Withdrawing Participant, Paid Minimum Minimum [Member] EBP, Related Party and Party-in-Interest [Axis] EBP, Related Party and Party-in-Interest [Axis] Investment Type [Axis] Investment Type [Axis] Administrative Fees Administrative Fees [Member] Administrative Fees Total contributions EBP, Change in Net Asset Available for Benefit, Increase from Contribution Liabilities Liabilities [Abstract] Net appreciation of investments EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Gain (Loss) on Investment EBP, Description of Plan [Line Items] EBP, Description of Plan [Line Items] Investment, Issuer Name [Axis] Investment, Issuer Name [Axis] EBP, Investment, Fair Value [Line Items] EBP, Investment, Fair Value and NAV [Line Items] Description of Plan and Summary of Accounting Policies [Text Block] EBP, Description of Plan [Text Block] Investment, Issuer Name [Extensible Enumeration] EBP, Investment, Issuer Name [Extensible Enumeration] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Change in Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Statement of Net Asset Available for Benefit [Table] EBP, Schedule of Asset Held for Investment [Line Items] EBP, Schedule of Asset Held for Investment [Line Items] Interest EBP, Change in Net Asset Available for Benefit, Increase from Interest Income on Investment EBP, Tax Determination Letter, Date EBP, Tax Determination Letter, Date Contributions [Policy Text Block] EBP, Contribution [Policy Text Block] EBP, Schedule of Asset Held for Investment [Abstract] Total additions EBP, Change in Net Asset Available for Benefit, Increase Employer Contribution Receivable [Line Items] Employer Contribution Receivable [Line Items] Employer Contribution Receivable Investment income: EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment [Abstract] Investment, Identifier [Axis] Investment, Identifier [Axis] Fees paid by participants EBP, Change in Net Asset Available for Benefit, Decrease from Administrative Expense EBP, Asset Held for Investment EBP, Asset Held for Investment Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Participation Status [Extensible Enumeration] Stamp Taxes Stamp Taxes [Member] Stamp Taxes Investment Risk [Policy Text Block] EBP, Risk and Uncertainty [Policy Text Block] Employer Contribution Matching Amount in Dollars, Maximum Employer Contribution Matching Amount in Dollars, Maximum Employer Contribution Matching Amount in Dollars, Maximum EBP, Statement of Change in Net Asset Available for Benefit [Abstract] Fair Value, Inputs, Level 2 Fair Value, Inputs, Level 2 [Member] EBP, Tax Determination Letter, Obtained [true false] EBP, Tax Determination Letter, Obtained [true false] Plan Amendments [Text Block] EBP, Description of Plan Amendment [Text Block] EBP, Tax Status [Table] EBP, Tax Status [Table] Net increase EBP, Change in Net Asset Available for Benefit, Increase (Decrease) Party-in-Interest and Related Party Transactions [Text Block] EBP, Related Party and Party-in-Interest Transactions [Text Block] EBP, Employer Contribution Receivable [Table] EBP, Employer Contribution Receivable [Table] EBP, Employer Contribution Receivable EBP, Related Party and Party-in-Interest Transactions [Abstract] Excess contributions payable EBP, Excess Contribution Payable EBP, Tax Qualification Status [Extensible Enumeration] EBP, Tax Qualification Status [Extensible Enumeration] Employer contribution receivable EBP, Employer Contribution, Receivable Benefits paid to participants EBP, Change in Net Asset Available for Benefit, Decrease from Payment to Participant Dividends EBP, Change in Net Asset Available for Benefit, Increase from Dividend Income on Investment Current Value EBP, Asset Held for Investment, Investment, Excluding Plan Interest in Master Trust, Current Value Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Assets Assets [Abstract] EBP, Statement of Net Asset Available for Benefit [Abstract] Investment, Current Value, Type [Extensible Enumeration] EBP, Investment, Current Value, Type [Extensible Enumeration] EBP, Tax Status [Abstract] EBP, Employer Contribution Receivable [Line Items] EBP, Employer Contribution Receivable [Line Items] EBP, Employer Contribution Receivable [Line Items] Collective Investment Funds Collective Investment Funds [Member] Collective Investment Funds Document Period End Date Document Period End Date EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Table] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] EBP, Reconciliation of Financial Statement to Form 5500 [Line Items] Benefits paid to participants per the Form 5500 EBP, Form 5500 Caption, Benefit Payment and Payments to Provide Benefits Reconciliation of Financial Statements to Form 5500 [Text Block] EBP, Reconciliation of Financial Statement to Form 5500 [Text Block] Administration of the Plan [Abstract] Administration of the Plan [Abstract] Administration of the Plan Investments [Policy Text Block] EBP, Investment [Policy Text Block] Investment, Party-in-Interest EBP, Asset Held for Investment, Party-in-Interest [true false] Document Type Document Type Administrative Fee Type [Axis] Administrative Fee [Axis] Administrative Fee Termination of Plan [Text Block] EBP, Plan Termination [Text Block] Vesting [Policy Text Block] Vesting [Policy Text Block] Vesting Entity Central Index Key Entity Central Index Key Loan Processing Fees Loan Processing Fees [Member] Loan Processing Fees EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Asset Held for Investment, Participant Loan, Interest Rate EBP, Reconciliation of Financial Statement to Form 5500 [Abstract] EBP, Tax Status [Line Items] EBP, Tax Status [Line Items] Deductions from net assets attributed to: EBP, Change in Net Asset Available for Benefit, Decrease [Abstract] EBP, Forfeited Nonvested Account, Decrease from Employer Contribution EBP, Forfeited Nonvested Account, Decrease from Employer Contribution Notes receivable from participants EBP, Note Receivable from Participant Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Entity Registrant Name Entity Registrant Name Tax Status [Text Block] EBP, Tax Status [Text Block] EBP, Sponsor [Member] EBP, Sponsor [Member] EBP, Sponsor EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Note Receivable from Participant, Account, Maximum Borrowing, to Total Account, Percentage EBP, Participant Contribution, Pretax, Maximum Annual Contribution To Company Stock, Percentage EBP, Participant Contribution, Pretax, Maximum Annual Contribution To Company Stock, Percentage EBP, Participant Contribution, Pretax, Maximum Annual Contribution To Company Stock, Percentage Administrative Fee Type [Domain] Administrative Fee Type [Domain] Administrative Fee Type Investment, Issuer Name [Domain] Investment, Issuer Name [Domain] Notes Receivable from Participants [Policy Text Block] EBP, Note Receivable from Participant [Policy Text Block] Participant Contribution Pretax Maximum Annual Contribution To Eligible Compensation Percentage Employee Benefit Plan Participant Contribution Pretax Maximum Annual Contribution To Eligible Compensation Percentage Employee Benefit Plan Participant Contribution Pretax Maximum Annual Contribution To Eligible Compensation Percentage Total investment income EBP, Change in Net Asset Available for Benefit, Increase (Decrease) from Income (Loss) on Investment Expedited Check Fees Expedited Check Fees [Member] Expedited Check Fees Amounts allocated to withdrawing participants at end of year EBP, Reconciliation to Form 5500, Payment to Participant, Increase from Allocation to Withdrawing Participant, Not yet Paid EBP, Related Party and Party-in-Interest Transactions [Line Items] EBP, Related Party and Party-in-Interest Transactions [Line Items] Fair Value, Inputs, Level 3 Fair Value, Inputs, Level 3 [Member] Net assets available for plan benefits Net assets available for plan benefits, beginning of year Net assets available for plan benefits, end of year Net assets available for plan benefits, end of year EBP, Net Asset Available for Benefit Entity [Domain] Entity [Domain] EBP, Forfeited Nonvested Account EBP, Forfeited Nonvested Account EBP, Employer Contribution, Matching Percentage EBP, Employer Contribution, Matching Percentage Net assets available for plan benefits per the Form 5500 EBP, Form 5500 Caption, Net Assets EBP, Investment, Fair Value [Table] EBP, Investment, Fair Value and NAV [Table] Notes Receivable From Participants Loan Term, Maximum Notes Receivable From Participants Loan Term, Maximum Notes Receivable From Participants Loan Term, Maximum EBP, Statement of Net Asset Available for Benefit [Line Items] EBP, Statement of Net Asset Available for Benefit [Line Items] Qualified Plan [Member] American Funds EuroPacific Growth Fund (Class R-6) [Member] American Funds EuroPacific Growth Fund (Class R-6) EBP, Participant-Directed [Member] Baird Aggregate Bond Fund (Institutional Shares) [Member] Baird Aggregate Bond Fund (Institutional Shares) Dimensional Fund Advisors U.S. Small Cap Portfolio (I) Fund [Member] Dimensional Fund Advisors U.S. Small Cap Portfolio (I) Fund Common Collective Trust [Member] Invesco Stable Value Trust Fund (Class B1) [Member] Invesco Stable Value Trust Fund (Class B1) Common stock of Publix Super Markets, Inc. [Member] Common stock of Publix Super Markets, Inc. State Street Institutional U.S. Government Money Market Fund (Premier Class) [Member] State Street Institutional U.S. Government Money Market Fund (Premier Class) State Street S&P 500 Index Fund (Class II) [Member] State Street S&P 500 Index Fund (Class II) State Street S&P Mid Cap Index Fund (Class XIV) [Member] State Street S&P Mid Cap Index Fund (Class XIV) State Street Target Retirement 2025 Fund (Class I) [Member] State Street Target Retirement 2025 Fund (Class I) State Street Target Retirement 2030 Fund (Class I) [Member] State Street Target Retirement 2030 Fund (Class I) State Street Target Retirement 2035 Fund (Class I) [Member] State Street Target Retirement 2035 Fund (Class I) State Street Target Retirement 2040 Fund (Class I) [Member] State Street Target Retirement 2040 Fund (Class I) State Street Target Retirement 2045 Fund (Class I) [Member] State Street Target Retirement 2045 Fund (Class I) State Street Target Retirement 2050 Fund (Class I) [Member] State Street Target Retirement 2050 Fund (Class I) State Street Target Retirement 2055 Fund (Class I) [Member] State Street Target Retirement 2055 Fund (Class I) State Street Target Retirement 2060 Fund (Class I) [Member] State Street Target Retirement 2060 Fund (Class I) State Street Target Retirement 2065 Fund (Class I) [Member] State Street Target Retirement 2065 Fund (Class I) State Street Target Retirement 2070 Fund (Class I) [Member] State Street Target Retirement 2070 Fund (Class I) State Street Target Retirement Fund (Class I) [Member] State Street Target Retirement Fund (Class I) T. Rowe Price Large Cap Growth Trust Fund (Class D) [Member] T. Rowe Price Large Cap Growth Trust Fund (Class D) T. Rowe Price U.S. Value Equity Trust Fund (Class B) [Member] T. Rowe Price U.S. Value Equity Trust Fund (Class B)