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Summary of Short-Term Investments by Geographic Area (Detail) - USD ($) $ in Thousands | Apr. 30, 2017 | May 01, 2016
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Schedule of Investments [Line Items] |  |
short-term investments | $ 2,443 | $ 4,359
Canada [Member] |  |
Schedule of Investments [Line Items] |  |
short-term investments | 1,362 | 3,294
United States [Member] |  |
Schedule of Investments [Line Items] |  |
short-term investments | $ 1,081 | $ 1,065

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