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Summary of Total Cost and Employer Contributions (Detail) - USD ($) $ in Thousands	4 Months Ended
	Apr. 24, 2021	Apr. 18, 2020
Compensation And Retirement Disclosure [Abstract]
Defined Contribution Plan, Plan Name [Extensible List]	flo:FourZeroOneKRetirementSavingsPlanMember	flo:FourZeroOneKRetirementSavingsPlanMember
Total cost and employer contributions	$ 9,136	$ 8,629

X

- References

No definition available.

+ Details

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

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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X

- Definition

Indicates name of defined contribution plan designed to provide retirement benefits. Includes, but is not limited to, legal name of plan.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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