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Long-Term Debt - Average Daily Excess Availability for Preceding Fiscal Quarter (Detail)	12 Months Ended
	Dec. 31, 2017
Second Amendment to Credit Agreement [Member] | Level I [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Greater than or equal to $100,000,000
LIBO Rate Applicable Margin	1.25%
Base Rate Applicable Margin	0.25%
Second Amendment to Credit Agreement [Member] | Level II [Member]
Line Of Credit Facility [Line Items]
Average Daily 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%
Second Amendment to Credit Agreement [Member] | Level III [Member]
Line Of Credit Facility [Line Items]
Average Daily Availability	Less than $40,000,000
LIBO Rate Applicable Margin	1.75%
Base Rate Applicable Margin	0.75%
Third Amendment to 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%
Third Amendment to 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%

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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X

- Details

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X

- Details

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X

- Details

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