Capital lease term.

No definition available.

Name:	bgi_CapitalLeaseTerm
Namespace Prefix:	bgi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Debt instrument monthly payment.

+ References

No definition available.

+ Details

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

- Definition

Interest rate on cash advances.

+ References

No definition available.

+ Details

Name:	bgi_InterestRateOnCashAdvances
Namespace Prefix:	bgi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of installment of term loan.

+ References

No definition available.

+ Details

Name:	bgi_NumberOfInstallmentOfTermLoan
Namespace Prefix:	bgi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Repayment of loan period.

+ References

No definition available.

+ Details

Name:	bgi_RepaymentOfLoanPeriod
Namespace Prefix:	bgi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage points added to the reference rate to compute the variable rate on the lessor's capital lease (sales-type and direct financing leases).

+ References

No definition available.

+ Details

Name:	us-gaap_CapitalLeasesOfLessorContingentRentalsBasisSpreadOnVariableRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20

-Article 5

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

+ Details

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

- Definition

The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR.

+ References

No definition available.

+ Details

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

- Definition

Maximum contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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

- Definition

Amount of the required periodic payments applied to principal.

+ References

+ Details

Name:	us-gaap_DebtInstrumentPeriodicPaymentPrincipal
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Date the credit facility terminates, in CCYY-MM-DD format.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityExpirationDate1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 20, 22

-Article 5

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7

+ Details

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

- Definition

The financing cost related to leases that have been recorded under the deposit method, as a financing or as a capital leases in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Imputed Interest Rate

-URI http://asc.fasb.org/extlink&oid=6515215

+ Details

Name:	us-gaap_SaleLeasebackTransactionImputedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the monthly rental payments due under the lease entered into in connection with the transactions involving the sale of property to another party and the lease of the property back to the seller.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 40

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6456341&loc=d3e50796-112755

+ Details

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

- Definition

Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

+ References

+ Details

Name:	us-gaap_SecuredDebt
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 set, unchanging rate.

+ References

No definition available.

+ Details

Name:	us-gaap_ShortTermDebtPercentageBearingFixedInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CapitalLeaseObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bgi_TermLoanFromInvestissementOfQuebecPrimePlusSevenPercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_LongtermDebtTypeAxis=bgi_TermLoanFromInvestissementOfQuebecPrimePlusFivePointFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandAndBuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_SeniorSubordinatedLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=bgi_LiborPlusNinePointSevenFivePercentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=bgi_LiborPlusSevenPointTwoFivePercentMemberMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

Long-term debt - Summary of Long Term Debt (Parenthetical) (Detail)	12 Months Ended
	Mar. 28, 2015 USD ($) Installment	Mar. 28, 2015 CAD Installment	Mar. 29, 2014 USD ($) Installment	Mar. 29, 2014 CAD Installment	Mar. 28, 2015 CAD	Mar. 29, 2014 CAD
Debt Instrument [Line Items]
Secured long term debt	9.50%				9.50%
Line of Credit Facility Expiration Date	Jun. 30, 2015	Jun. 30, 2015
Capital Leasing Arrangements [Member]
Debt Instrument [Line Items]
Debt Instrument Interest Rate Stated Percentage Rate Range Minimum	6.00%	6.00%	6.00%	6.00%
Debt Instrument Interest Rate Stated Percentage Rate Range Maximum	10.00%	10.00%	10.00%	10.00%
Term Loan from Investissement Quebec Prime Plus Seven Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 3,643,000		$ 4,519,000
Annual rate of prime plus	7.00%		7.00%		7.00%	7.00%
Number of installments \| Installment	60	60	60	60
Capital repayments	$ 66,242	CAD 83,333	$ 66,242	CAD 83,333
Balance of term loan \| CAD					CAD 4,600,000	CAD 5,000,000
Term Loan from Investissement Quebec Prime Plus Five Point Five Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 3,478,000		$ 4,708,000
Annual rate of prime plus	5.50%		5.50%		5.50%	5.50%
Number of installments \| Installment	48	48	48	48
Capital repayments	$ 165,607	CAD 208,333	$ 165,607	CAD 208,333
Balance of term loan \| CAD					CAD 4,375,000	CAD 5,208,000
Land and Building [Member] \| Capital Leasing Arrangements [Member]
Debt Instrument [Line Items]
Sale Leaseback transaction implicit annual interest	10.74%	10.74%	10.74%	10.74%
Capital lease period	20 years	20 years	20 years	20 years
Repayments Of Debt And Capital Lease Obligations	$ 133,356	CAD 167,762	$ 133,356	CAD 167,762
Outstanding amount of repayment \| CAD					CAD 12,846,000	CAD 13,444,000
Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term debt	$ 33,000,000		$ 28,000,000
Term Loan Facility [Member] \| Senior Subordinated Loans [Member]
Debt Instrument [Line Items]
Secured long term debt	8.77%		8.77%		8.77%	8.77%
Line of Credit Facility Expiration Date	Aug. 31, 2018	Aug. 31, 2018	Aug. 31, 2018	Aug. 31, 2018
Term Loan Facility [Member] \| Senior Subordinated Loans [Member] \| LIBOR Plus 9.75% [Member]
Debt Instrument [Line Items]
Long-term debt	$ 28,000,000
Interest rate description	LIBOR plus 9.75%	LIBOR plus 9.75%
Long-term debt interest rate	9.75%	9.75%
Term Loan Facility [Member] \| Senior Subordinated Loans [Member] \| LIBOR Plus 7.25% [Member]
Debt Instrument [Line Items]
Long-term debt			$ 5,000,000
Interest rate description			LIBOR plus 7.25%	LIBOR plus 7.25%
Long-term debt interest rate			7.25%	7.25%
Cash Contribution [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,500,000		$ 1,500,000
Interest on Cash advances	11.00%	11.00%	11.00%	11.00%
Term Loan from Investissement Quebec Prime Plus Ten Percent [Member]
Debt Instrument [Line Items]
Long-term debt	$ 1,590,000
Annual rate of prime plus	10.00%		10.00%		10.00%	10.00%
Capital repayment period	48 months	48 months	48 months	48 months
Periodic principal payment due	$ 33,334	CAD 41,667	$ 33,334	CAD 41,667
Outstanding amount of repayment \| CAD					CAD 2,000,000