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v3.20.1

RELATED PARTY TRANSACTIONS (Details Textual) | 12 Months Ended
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Dec. 30, 2018 transaction
Related Party Transactions [Abstract] |
Number of equity transactions | 1

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- Definition Number of Equity Transactions + References No definition available. + Details
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Namespace Prefix: | bgsf_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration