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Common Stock Repurchase Program (Detail) - Common Stock - USD ($)	9 Months Ended		12 Months Ended
	Jan. 29, 2017	Jan. 31, 2016	May 01, 2016	Jun. 15, 2016
Stockholders Equity Note [Line Items]
Common stock repurchased			100,776
Common Stock Repurchase Program June 15, 2016 [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock				$ 5,000,000
Common stock repurchased	0	0
Remaining authorized repurchase amount	$ 5,000,000

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Number of shares that have been repurchased and retired during the period.

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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(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Topic 505
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