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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 30, 2014 Quarters	Mar. 31, 2013
Accounting Policies [Abstract]
Reporting period, minimum	364 days
Reporting period, maximum	371 days
Interim reporting periods	91 days	91 days
Recognized gift card breakage revenue	$ 108,000	$ 104,000
Estimated gift card redemption period	20
Long-lived assets to be held and used	$ 400,000

X

- Definition

The period of time over which gift card breakage is recognized.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgfv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Interim reporting period.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgfv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The maximum period for which financial information can be reported for the entity. Translates to a 53-week fiscal year, which can occur every three or four years based upon the entity's calendar shift relative to the impact of a leap year on the entity's fiscal calendar and an extra day each year resulting from a 52-week fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	bgfv_
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Balance Type:	na
Period Type:	duration

X

- Definition

The minimum period for which financial information can be reported for the entity. Translates to a 52-week fiscal year.

+ References

No definition available.

+ Details

Name:	bgfv_FinancialInformationReportingPeriodMinimum
Namespace Prefix:	bgfv_
Data Type:	xbrli:durationItemType
Balance Type:	na
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X

- Details

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Data Type:	xbrli:stringItemType
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X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 41

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599

+ Details

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

X

- Definition

The amount of breakage recognized related to unredeemed gift cards. Breakage occurs when a customer pays in advance of vendor performance and does not demand full performance for various reasons.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SAB TOPIC 13.B.Q1)

-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 605

-SubTopic 10

-URI http://asc.fasb.org/subtopic&trid=2197196



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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Breakage

-URI http://asc.fasb.org/extlink&oid=6506468

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Balance Type:	credit
Period Type:	duration