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v3.19.2

Long-term debt - Additional Information (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Mar. 30, 2019 USD ($) | Mar. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |  |
Outstanding letters of credit | $ 1.0 | $ 1.0
Investissement Quebec [Member] |  |
Line of Credit Facility [Line Items] |  |
Minimum capital ratio required | 1.15 |

X
- Definition Line of credit covenant working capital ratio minimum. + References No definition available. + Details
Name: | bgi_LineOfCreditCovenantWorkingCapitalRatioMinimum
Namespace Prefix: | bgi_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=bgi_InvestissementQuebecMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |