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Long-Term Debt - Average Daily Excess Availability for Preceding Fiscal Quarter (Detail) - Loan, Guaranty and Security Agreement [Member] | Feb. 24, 2021
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Level I [Member] |
Line Of Credit Facility [Line Items] |
Average Daily Availability | Greater than or equal to $70,000,000
SOFR Rate Applicable Margin | 1.375%
Base Rate Applicable Margin | 0.375%
Level II [Member] |
Line Of Credit Facility [Line Items] |
Average Daily Availability | Less than $70,000,000
SOFR Rate Applicable Margin | 1.50%
Base Rate Applicable Margin | 0.50%

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- Definition Applicable margin applied to the base rate. For these purposes, the base rate equals the prime rate. + References No definition available. + Details
Name: | bgfv_LineOfCreditBasisOfSpreadOnBaseRate
Namespace Prefix: | bgfv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line of credit basis of spread on SOFR rate. + References No definition available. + Details
Name: | bgfv_LineOfCreditBasisOfSpreadOnSofrRate
Namespace Prefix: | bgfv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Description of the conditions for borrowing under the credit facility including the nature of any restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityCovenantTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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_DebtInstrumentAxis=bgfv_LoanGuarantyAndSecurityAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=bgfv_CreditFacilityLevelOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_CreditFacilityAxis=bgfv_CreditFacilityLevelTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |