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v3.23.1

TEAM MEMBER BENEFIT PLAN (Details Textual) $ in Millions | 3 Months Ended
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Apr. 02, 2023 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Defined contribution plan, cost recognized | $ 0.5
First 3% Employee Compensation |
Defined Benefit Plan Disclosure [Line Items] |
Defined contribution plan, employer matching contribution, percent of match | 100.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay | 3.00%
Next 2% Employee Compensation |
Defined Benefit Plan Disclosure [Line Items] |
Defined contribution plan, employer matching contribution, percent of match | 50.00%
Defined contribution plan, employer matching contribution, percent of employees' gross pay | 2.00%

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- 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

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- 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 https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Details
Name: | bgsf_DefinedContributionPlanCriteriaAxis=bgsf_FirstThreePercentEmployeeCompensationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | bgsf_DefinedContributionPlanCriteriaAxis=bgsf_NextTwoPercentEmployeeCompensationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |