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v3.21.1

Long-Term Debt - Average Daily Excess Availability for Preceding Fiscal Quarter (Detail) |  | 3 Months Ended
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Feb. 24, 2021 | Apr. 04, 2021
Loan, Guaranty and Security Agreement [Member] | Level I [Member] |  |
Line Of Credit Facility [Line Items] |  |
Average Daily Availability | Greater than or equal to $70,000,000 |
LIBO Rate Applicable Margin | 1.375% |
Base Rate Applicable Margin | 0.375% |
Loan, Guaranty and Security Agreement [Member] | Level II [Member] |  |
Line Of Credit Facility [Line Items] |  |
Average Daily Availability | Less than $70,000,000 |
LIBO Rate Applicable Margin | 1.50% |
Base Rate Applicable Margin | 0.50% |
Prior Credit Agreement [Member] | Level I [Member] |  |
Line Of Credit Facility [Line Items] |  |
Average Daily Availability |  | Greater than or equal to $70,000,000
LIBO Rate Applicable Margin |  | 1.25%
Base Rate Applicable Margin |  | 0.25%
Prior Credit Agreement [Member] | Level II [Member] |  |
Line Of Credit Facility [Line Items] |  |
Average Daily Availability |  | Less than $70,000,000
LIBO Rate Applicable Margin |  | 1.375%
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: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Applicable margin applied to the LIBO rate. + References No definition available. + Details
Name: | bgfv_LineOfCreditBasisOfSpreadOnLiborRate
Namespace Prefix: | bgfv_
Data Type: | num: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 http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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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: |

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- Details
Name: | us-gaap_DebtInstrumentAxis=bgfv_PriorCreditAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |