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Common Stock Repurchase Program (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 28, 2018	Jul. 29, 2018	Nov. 03, 2019	Oct. 28, 2018	Sep. 05, 2019
Stockholders Equity Note [Line Items]
Cost of common stock repurchase	$ 772,000	$ 72,000
Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchased	33,890	2,990		36,880
Cost of common stock repurchase	$ 2,000
Common Stock Repurchase Program June 15, 2016 [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchased				36,880
Cost of common stock repurchase				$ 844,000
Stock Repurchase Program September 5, 2019 [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock					$ 5,000,000
Common stock repurchased			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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