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Employer Contributions (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jan. 03, 2015 | Dec. 28, 2013 | Dec. 29, 2012
IAM National Pension Fund |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
EIN | 516031295 |  |
Pension Plan No. | 002 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending/ Implemented | No |  |
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | May 01, 2016 |  |
Contributions | $ 99 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_IamNationalPensionFundMember | $ 104 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_IamNationalPensionFundMember | $ 101 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_IamNationalPensionFundMember
Retail Wholesale And Department Store International Union And Industry Pension Fund |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
EIN | 630708442 |  |
Pension Plan No. | 001 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending/ Implemented | No |  |
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Aug. 12, 2017 |  |
Contributions | 132 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_RetailWholesaleAndDepartmentStoreInternationalUnionAndIndustryPensionFundMember | 130 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_RetailWholesaleAndDepartmentStoreInternationalUnionAndIndustryPensionFundMember | 115 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_RetailWholesaleAndDepartmentStoreInternationalUnionAndIndustryPensionFundMember
Western Conference Of Teamsters Pension Trust |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
EIN | 916145047 |  |
Pension Plan No. | 001 |  |
Pension Protection Act Zone Status | Green | Green |
FIP/RP Status Pending/ Implemented | No |  |
Surcharge Imposed | No |  |
Expiration Date of Collective Bargaining Agreement | Feb. 04, 2017 |  |
Contributions | 260 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_WesternConferenceOfTeamstersPensionTrustMember | 252 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_WesternConferenceOfTeamstersPensionTrustMember | 283 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_WesternConferenceOfTeamstersPensionTrustMember
BC&T International Pension Fund |  |  |
Defined Contribution and Defined Benefit Plans [Line Items] |  |  |
EIN | 526118572 |  |
Pension Plan No. | 001 |  |
Pension Protection Act Zone Status | Red | Red |
FIP/RP Status Pending/ Implemented | Implemented |  |
Surcharge Imposed | Yes |  |
Expiration Date of Collective Bargaining Agreement | Oct. 31, 2015 |  |
Contributions | $ 1,077 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_BcandtInternationalPensionFundMember | $ 939 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_BcandtInternationalPensionFundMember | $ 797 us-gaap_MultiemployerPlanPeriodContributions / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = flo_BcandtInternationalPensionFundMember

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- Definition Three digit plan number for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Amount of contributions made to multiemployer plans by the employer. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450691-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "pending", "implemented", "other", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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- Definition Indicate whether the employer paid a surcharge to the pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. The acceptable values are "no", "yes", and "NA". + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450657-114947 + Details
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