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Common Stock Repurchase Program (Detail) - USD ($)	12 Months Ended
	Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017	Jun. 15, 2016
Stockholders Equity Note [Line Items]
Cost of common stock repurchase	$ 3,323,000
Common Stock [Member]
Stockholders Equity Note [Line Items]
Common stock repurchased	160,823
Cost of common stock repurchase	$ 8,000
Common Stock Repurchase Program June 15, 2016 [Member] | Common Stock [Member]
Stockholders Equity Note [Line Items]
Authorization amount for repurchase of common stock				$ 5,000,000
Common stock repurchased	160,823	0	0
Remaining authorized repurchase amount	$ 1,700,000

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

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