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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) | Jul. 30, 2017 | Apr. 30, 2017 | Jul. 31, 2016
--- | --- | --- | ---
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax asset | $ 436,000 | $ 419,000 | [1] | $ 1,942,000
Non-current deferred tax liability | 4,253,000 | 3,593,000 | [1] | 1,532,000
U.S. Tax Authorities [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax asset |  |  |  | 1,400,000
Non-current deferred tax liability | 2,300,000 | 1,500,000 |  |
China [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax asset | 436,000 | 419,000 |  | 561,000
Canada [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Non-current deferred tax liability | $ 2,000,000 | $ 2,100,000 |  | $ 1,500,000
[1] | Derived from audited financial statements.

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