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Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016	Jan. 31, 2017
Income Tax Disclosure [Abstract]
Income tax expense	$ 231,000	$ 496,000	$ 378,000	$ 972,000
Income tax benefit from expiration of the statue of limitations		97,000	71,000	97,000
Income tax benefit from windfall of stock	12,000		27,000
Income tax benefit from disqualifying dispositions of stock		$ 39,000		39,000
Income tax benefit from filing of amended return				$ 52,000
Cumulative unrecognized tax benefits	$ 663,000		663,000		$ 708,000
Developments affecting unrecognized tax benefits			$ 0

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Tax benefits increases resulting from disqualifying dispositions.

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Amount of increase in tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in tax benefits resulting from lapses of applicable statutes of limitations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Section 50
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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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