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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) | Jan. 28, 2018 | Apr. 30, 2017 | Jan. 29, 2017
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Income Taxes [Line Items] |  |  |  |
Non-current deferred tax asset | $ 1,942,000 | $ 419,000 | [1] | $ 422,000
Non-current deferred tax liability | 2,096,000 | 3,593,000 | [1] | 2,924,000
U.S. Tax Authorities [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax asset | 1,500,000 |  |  |
Non-current deferred tax liability |  | 1,500,000 |  | 1,200,000
China [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax asset | 461,000 | 419,000 |  | 422,000
Canada [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax liability | $ 2,096,000 | $ 2,100,000 |  | $ 1,700,000
[1] | Derived from audited financial statements.

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