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Long-Term Debt - Average Daily Excess Availability for Preceding Fiscal Quarter (Detail) - Jun. 28, 2015 - Second Amendment to Credit Agreement [Member]	Total
Level I [Member]
Line of Credit Facility [Line Items]
Average Daily Excess Availability	Greater than or equal to $100,000,000
LIBO Rate Applicable Margin	1.25%
Base Rate Applicable Margin	0.25%
Level II [Member]
Line of Credit Facility [Line Items]
Average Daily Excess Availability	Less than $100,000,000 but greater than or equal to $40,000,000
LIBO Rate Applicable Margin	1.50%
Base Rate Applicable Margin	0.50%
Level III [Member]
Line of Credit Facility [Line Items]
Average Daily Excess Availability	Less than $40,000,000
LIBO Rate Applicable Margin	1.75%
Base Rate Applicable Margin	0.75%

X

- Definition

Applicable margin applied to the base rate. For these purposes, the base rate equals the prime rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgfv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Applicable margin applied to the LIBO rate.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgfv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Description of the conditions for borrowing under the credit facility including the nature of any restrictions.

+ 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 210.5-02.19(b),22(b))



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

+ Details

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X

- 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

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X

- Details

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X

- Details

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Period Type:

X

- Details

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X

- Details

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