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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)
Oct. 29, 2017
Apr. 30, 2017
Oct. 30, 2016
Income Taxes [Line Items]      
Non-current deferred tax asset $ 491,000 $ 419,000 [1] $ 581,000
Non-current deferred tax liability 4,641,000 3,593,000 [1] 1,699,000
U.S. Tax Authorities [Member]      
Income Taxes [Line Items]      
Non-current deferred tax asset     109,000
Non-current deferred tax liability 2,500,000 1,500,000  
China [Member]      
Income Taxes [Line Items]      
Non-current deferred tax asset 491,000 419,000 472,000
Canada [Member]      
Income Taxes [Line Items]      
Non-current deferred tax liability $ 2,100,000 $ 2,100,000 $ 1,699,000
[1] Derived from audited financial statements.