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Common Stock Repurchase Program (Detail) - Common Stock Repurchase Program June 15, 2016 [Member] - Common Stock [Member] - USD ($)	9 Months Ended
	Jan. 28, 2018	Jan. 29, 2017	Jun. 15, 2016
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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Stockholders Equity Note [Line Items]

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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-Name Accounting Standards Codification
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