Debt instrument covenant fixed charge coverage ratio.

No definition available.

Name:	bgi_DebtInstrumentCovenantFixedChargeCoverageRatio
Namespace Prefix:	bgi_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Excess availability to be maintained for the next twelve months.

+ References

No definition available.

+ Details

Name:	bgi_ExcessAvailabilityToBeMaintainedForTheNextTwelveMonths
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line of credit facility additional borrowing capacity.

+ References

No definition available.

+ Details

Name:	bgi_LineOfCreditFacilityAdditionalBorrowingCapacity
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of credit facility covenant terms cash minimum.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Line of credit facility excess availability trigger.

+ References

No definition available.

+ Details

Name:	bgi_LineOfCreditFacilityExcessAvailabilityTrigger
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of credit facility excess availability trigger percentage.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of credit facility excess availability trigger percentage of line cap.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of minimum borrowing base.

+ References

No definition available.

+ Details

Name:	bgi_PercentageOfMinimumBorrowingBase
Namespace Prefix:	bgi_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Senior secured revolving credit facility seasonal availability block.

+ References

No definition available.

+ Details

Name:	bgi_SeniorSecuredRevolvingCreditFacilitySeasonalAvailabilityBlock
Namespace Prefix:	bgi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-4

+ Details

Name:	us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

+ References

+ Details

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

- Definition

Date when the debt instrument is scheduled to be fully repaid, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
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-Subparagraph (d)
-Publisher FASB
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-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

Name:	us-gaap_DebtInstrumentMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-Publisher FASB
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-SubTopic 20
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-Section 50
-Paragraph 1D
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1D

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
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-Publisher FASB
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+ Details

Name:	us-gaap_LineOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19))
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-SubTopic 210
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-Paragraph 1
-Subparagraph (SX 210.9-03(13))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

+ Details

Name:	us-gaap_LinesOfCreditCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Mortgage loan related to property sales in noncash investing and financing activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-5

+ Details

Name:	us-gaap_MortgageLoanRelatedToPropertySales1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

Name:	us-gaap_OtherCommitment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The portion of the carrying amount of short-term borrowings outstanding as of the balance sheet date, which accrues interest at a rate subject to change from time to time.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtPercentageBearingVariableInterestRate
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_CreditFacilityAxis=bgi_CreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=bgi_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=bgi_AmendedCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=bgi_AmendedTermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=bgi_AmendedCreditFacilityAndAmendedTermLoanMember
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Data Type:	na
Balance Type:
Period Type:

- Details

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Bank Indebtedness - Additional Information (Detail) $ in Millions				1 Months Ended	12 Months Ended
	Jan. 31, 2024 USD ($)	Dec. 24, 2021	Oct. 23, 2017 USD ($)	Jan. 20, 2024 USD ($)	Mar. 30, 2024 CAD ($)	Mar. 30, 2024 USD ($)	Mar. 25, 2023 USD ($)	Mar. 12, 2020	Jun. 29, 2018 USD ($)
Line of Credit Facility [Line Items]
Bank indebtedness						$ 63,372,000	$ 57,890,000
New credit facility maturity date		Dec. 31, 2026
Line of credit facility covenant terms cash minimum						8,500,000
Minimum excess availability percentage of borrowings					40.00%
Minimum excess availability percentage of line cap					25.00%
Mortgage on movable property (general) under the Civil Code (Quebec)					$ 200.0
Excess availability to be maintained for the next twelve months						8,500,000
Credit Facility [Member]
Line of Credit Facility [Line Items]
Minimum excess availability			$ 8,500,000
Senior secured credit facility			$ 85,000
New credit facility maturity date			Oct. 31, 2022
Total commitments			$ 5,000,000
Line of credit facility covenant terms cash minimum			$ 8,500,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Minimum excess availability									$ 8,500,000
Interest rate of CORRA plus spread								7.00%
Long-term senior secured term loan									12,500,000
Senior secured revolving credit facility, seasonal availability block	$ 2,000,000			$ 5,000,000
Line of credit facility covenant terms cash minimum									$ 8,500,000
Percentage of minimum borrowing base									10.00%
Amended Credit Facility [Member]
Line of Credit Facility [Line Items]
Bank indebtedness						63,400,000	57,900,000
Long-term debt, gross						63,700,000	58,300,000
Senior secured revolving credit facility, excess availability						13,400,000	12,900,000
New credit facility maturity date		Dec. 31, 2026
Net of deferred financing costs						$ 300,000	$ 400,000
Amended Term Loan [Member]
Line of Credit Facility [Line Items]
Interest rate of CORRA plus spread									7.00%
Amended Credit Facility And Amended Term Loan [Member]
Line of Credit Facility [Line Items]
Debt instrument, covenant description					In the event that excess availability falls below $8.5 million for more than two consecutive business days once during any fiscal month, this would be considered an event of default under the Company’s Amended Credit Facility and its Amended Term Loan, that provides the lenders the right to require the outstanding balances borrowed under the Company’s Amended Credit Facility and its Amended Term Loan become due immediately, which would result in cross defaults on the Company’s other borrowings. The Company expects to have excess availability of at least $8.5 million for at least the next twelve months from the date of issuance of these financial statements.
Maximum [Member]
Line of Credit Facility [Line Items]
Fixed charge coverage ratio					1.1
Maximum [Member] \| Amended Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate of CORRA plus spread			2.00%			2.00%		7.75%
Maximum [Member] \| Amended Term Loan [Member]
Line of Credit Facility [Line Items]
Interest rate of CORRA plus spread									7.75%
Minimum [Member]
Line of Credit Facility [Line Items]
Fixed charge coverage ratio					1
Minimum [Member] \| Amended Credit Facility [Member]
Line of Credit Facility [Line Items]
Interest rate of CORRA plus spread			1.50%			1.50%		6.75%
Minimum [Member] \| Amended Term Loan [Member]
Line of Credit Facility [Line Items]
Interest rate of CORRA plus spread		6.75%