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Acquisitions (Lepage acquisition) - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 6 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Jul. 21, 2012 | Dec. 29, 2012 | Jul. 13, 2013 | Jul. 13, 2013
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related tax adjustments |  | $ 1,016,000 flo_GoodwillAdjustmentBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNonCurrent |  |  |  |
Adjustment to assets held for sale |  | 63,000 flo_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsHeldForSale |  |  |  |
Working capital adjustments |  | 315,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets |  |  |  |
Implied fair value of restricted shares | 45,887,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable |  |  |  |  |
Value of Flowers shares issued | 50,000,000 flo_BusinessAcquisitionEquityInterestsIssuedOrIssuableBasisForDeterminingValue |  |  |  |  |
Goodwill | 282,960,000 us-gaap_Goodwill | 282,404,000 us-gaap_Goodwill |  | 269,897,000 us-gaap_Goodwill |  |
Fair value of trade receivable | 7,400,000 us-gaap_BusinessCombinationAcquiredReceivablesFairValue |  |  |  |  |
Gross amount receivable | 7,500,000 us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount |  |  |  |  |
Bad debt | 100,000 us-gaap_BusinessCombinationAcquiredReceivablesEstimatedUncollectible |  |  |  |  |
Lepage Bakeries Inc |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition |  |  | 318,600,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Deferred cash payment |  |  | 17,663,000 us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Fair value of gross payments of deferred obligation |  |  | 20,000,000 flo_BusinessAcquisitionConsiderationDeferredPaymentObligationsGross / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Shares issued during acquisition |  |  | 3,267,972 us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Preliminary aggregate purchase price |  |  | 382,200,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Acquisition-related costs |  |  |  | 7,100,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |
Goodwill purchase accounting adjustments | 900,000 us-gaap_GoodwillPurchaseAccountingAdjustments / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |  |  |
Acquisition-related tax adjustments | 1,016,000 flo_GoodwillAdjustmentBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNonCurrent / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember | 1,016,000 flo_GoodwillAdjustmentBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNonCurrent / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |  |
Adjustment to assets held for sale | 63,000 flo_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsHeldForSale / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember | 63,000 flo_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAssetsHeldForSale / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |  |
Adjustment for accrued liabilities | 1,500,000 flo_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentAccruedLiabilities / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |  |  |
Working capital adjustments | 315,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember | 315,000 us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialAssets / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |  |
Sales related to acquisition |  |  |  | 80,700,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |
Income from operation |  |  |  | 12,400,000 us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |
Business acquisition deferred payment terms | The deferred payment obligations represent the fair value of the fixed payments of $1,250,000 beginning on the first business day of each of the sixteen calendar quarters following the fourth anniversary of the closing of the acquisition (total of $20.0 million in gross payments). The first payment will be made by Flowers on October 1, 2016 and the final payment will be made on July 1, 2020. The difference between the fair value and the gross payments of $2.3 million is recorded as a reduction to the liability and is being amortized to interest expense over eight years. |  |  |  |  |
Business acquisition deferred payments fixed periodic payments |  |  | 1,250,000 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Business acquisition deferred payments, frequency of periodic payment | Sixteen calendar quarters following the fourth anniversary of the closing of the acquisition |  |  |  |  |
Business acquisition gross deferred payment |  |  | 20,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Business acquisition deferred payment unamortized discount |  |  | 2,300,000 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Deferred payment unamortized discount amortization period |  |  | 8 years |  |  |
Implied fair value of restricted shares |  |  | 45,887,000 us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Value of Flowers shares issued |  |  | 50,000,000 flo_BusinessAcquisitionEquityInterestsIssuedOrIssuableBasisForDeterminingValue / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Stock price, last trading day before closing |  |  | $ 13.65 us-gaap_BusinessAcquisitionSharePrice / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Indefinite lived trademark | 185,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |  |  |
Goodwill |  |  | 51,705,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |
Goodwill deductible for income tax purposes | 11,900,000 us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember |  |  |  |  |
Lepage Bakeries Inc | DSD Segment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | 51,700,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember / us-gaap_StatementOperatingActivitiesSegmentAxis = flo_DirectStoreDeliveryMember |  |  |  |  |
Lepage Bakeries Inc | Pennsylvania |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Bakeries operated | 3 flo_BusinessCombinationsNumberOfFacilitiesAcquired / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember / flo_BusinessAcquisitionSecondaryAxis = stpr_PA |  |  |  |  |
Lepage Bakeries Inc | Maine |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Bakeries operated | 2 flo_BusinessCombinationsNumberOfFacilitiesAcquired / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember / flo_BusinessAcquisitionSecondaryAxis = stpr_ME |  |  |  |  |
Lepage Bakeries Inc | Vermont |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of Bakeries operated | 1 flo_BusinessCombinationsNumberOfFacilitiesAcquired / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember / flo_BusinessAcquisitionSecondaryAxis = stpr_VT |  |  |  |  |
Lepage Bakeries Inc | 338(h)(10) Election Payment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition |  |  |  |  | 18,400,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember / flo_IncomeTaxContingencyAdjustmentsInTaxRateAxis = flo_ThreeThreeEighthTenElecetionPaymentMember |
Lepage Bakeries Inc | Working Capital Payment |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition |  |  |  |  |  | $ 200,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = flo_LepageBakeriesIncMember / flo_PaymentObligationsAxis = flo_WorkingCapitalMember

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- Definition Goodwill Adjustment Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Deferred Tax Liabilities Non current + References No definition available. + Details
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- Definition Number of shares of equity interests issued or issuable to acquire entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b)(4) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
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- Definition Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination. + References No definition available. + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the fair value of the receivables acquired, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=34752592&loc=d3e1043-128460 + Details
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- Definition Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition Amount of liabilities incurred by the acquirer as part of consideration transferred in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to items of consideration transferred in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition This element represents the amount of any measurement period adjustment (as defined) realized during the reporting period to financial assets acquired in connection with a business combination for which the initial accounting was incomplete. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1500-128463 + Details
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- Definition Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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