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Net (Loss) Income Per Share - Weighted Average Shares (Detail) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 28, 2018	Oct. 29, 2017	Jul. 30, 2017	Apr. 28, 2019	Apr. 29, 2018	Apr. 30, 2017
Earnings Per Share [Abstract]
weighted-average common shares outstanding, basic	12,384	12,438	12,515	12,510	12,450	12,436	12,440	12,399	12,462	12,431	12,312
dilutive effect of stock-based compensation									86	202	206
weighted-average common shares outstanding, diluted	12,384	12,465	12,551	12,600	12,611	12,436	12,580	12,590	12,548	12,633	12,518

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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