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Acquisitions (Acquired Hostess Bread Assets) - Additional Information (Detail) (Acquired Hostess Bread Asset, USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended | 0 Months Ended |
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Jul. 19, 2013 | Oct. 05, 2013 | Jan. 03, 2015 | Dec. 28, 2013 | Jan. 11, 2013 | Apr. 20, 2013
Business Acquisition [Line Items] |  |  |  |  |  |
Business acquisition | $ 355,342,000 us-gaap_PaymentsToAcquireBusinessesGross |  |  |  |  |
Gain on legal settlement | 1,400,000 us-gaap_GainLossRelatedToLitigationSettlement | 1,400,000 us-gaap_GainLossRelatedToLitigationSettlement |  |  |  |
Sales related to acquisition |  |  | 180,100,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual | 26,600,000 us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual |  |
Agreement Two |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition-related costs |  |  | 0 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember / us-gaap_TypeOfArrangementAxis = flo_AgreementTwoMember | 16,000,000 us-gaap_BusinessCombinationAcquisitionRelatedCosts / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember / us-gaap_TypeOfArrangementAxis = flo_AgreementTwoMember |  |
Aggregate purchase price |  |  |  |  | 30,000,000 us-gaap_BusinessCombinationConsiderationTransferred1 / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember / us-gaap_TypeOfArrangementAxis = flo_AgreementTwoMember |
Breakup fee received for unsuccessful bid |  |  |  |  |  | $ 900,000 us-gaap_BusinessAcquisitionPreacquisitionContingencyAmountOfSettlement / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember / us-gaap_TypeOfArrangementAxis = flo_AgreementTwoMember
Bakeries |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of assets acquired in acquisition | 20 flo_BusinessCombinationNumberOfAcquisitionsAssetPurchase / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = flo_BakeriesMember |  |  |  |  |
Depots |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of assets acquired in acquisition | 36 flo_BusinessCombinationNumberOfAcquisitionsAssetPurchase / us-gaap_BusinessAcquisitionAxis = flo_AcquiredHostessAssetsMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = flo_DepotsMember |  |  |  |  |

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- Definition Business Combination Number Of Bakeries and Depots Purchased + References No definition available. + Details
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- Details
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- Definition Amount paid or received to resolve the preacquisition contingency. + 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 (d) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 2 -Section A -Subsection 7 + 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 consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + 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 Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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