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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)
Jan. 28, 2018
Apr. 30, 2017
Jan. 29, 2017
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.