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Estimated Useful Lives by Property Plant and Equipment Class (Detail)	12 Months Ended
	Dec. 28, 2019
Buildings | Minimum
Property Plant And Equipment [Line Items]
Useful life term (years)	10 years
Buildings | Maximum
Property Plant And Equipment [Line Items]
Useful life term (years)	40 years
Machinery and Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful life term (years)	3 years
Machinery and Equipment | Maximum
Property Plant And Equipment [Line Items]
Useful life term (years)	25 years
Furniture, Fixtures and Transportation Equipment | Minimum
Property Plant And Equipment [Line Items]
Useful life term (years)	3 years
Furniture, Fixtures and Transportation Equipment | Maximum
Property Plant And Equipment [Line Items]
Useful life term (years)	15 years

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
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X

- Details

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X

- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_MachineryAndEquipmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=flo_FurnitureFixturesAndTransportationEquipmentMember
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