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Summary of Short-Term Investments by Geographic Area (Detail) - USD ($) $ in Thousands | Apr. 29, 2018 | Apr. 30, 2017
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Schedule of Investments [Line Items] |  |
Short-term investments | $ 2,451 | $ 2,443
Canada [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term investments | 1,366 | 1,362
United States [Member] |  |
Schedule of Investments [Line Items] |  |
Short-term investments | $ 1,085 | $ 1,081

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