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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($) | 12 Months Ended |
--- | --- | ---
Apr. 30, 2017 | May 01, 2016
Income Taxes [Line Items] |  |
U.S. foreign income tax credits | $ 1,436,000 | $ 1,436,000
U.S. foreign income tax credits, expiration period | 9 years |
U.S. foreign income tax credits, expiration fiscal year | 2026 |
Alternative minimum tax credit carryforward | $ 1,428,000 | 1,320,000
Non-current deferred income tax asset | 419,000 | 2,319,000
Non-current deferred income tax liability | 3,593,000 | 1,483,000
U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards | 9,000,000 |
Operating loss carryforwards, related future tax benefits | 3,800,000 |
Non-current deferred income tax asset |  | 1,700,000
Non-current deferred income tax liability | 1,500,000 |
China [Member] |  |
Income Taxes [Line Items] |  |
Non-current deferred income tax asset | 419,000 | 572,000
Canada [Member] |  |
Income Taxes [Line Items] |  |
Non-current deferred income tax liability | $ 2,100,000 | $ 1,483,000
Minimum [Member] | U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration period | 9 years |
Maximum [Member] | U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration period | 18 years |
Earliest Tax Year [Member] | U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration fiscal year | 2027 |
Latest Tax Year [Member] | U.S. Tax Authorities [Member] |  |
Income Taxes [Line Items] |  |
Operating loss carryforwards, expiration fiscal year | 2035 |

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