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Income Taxes - Deferred Income Taxes - Narrative (Detail) - USD ($)
$ in Thousands
Jan. 29, 2017
May 01, 2016
Jan. 31, 2016
Income Taxes [Line Items]      
Non-current deferred tax asset $ 422 $ 2,319 [1] $ 4,312
Non-current deferred tax liability 2,924 1,483 [1] 1,209
U.S. Tax Authorities [Member]      
Income Taxes [Line Items]      
Non-current deferred tax asset   1,700 3,500
Non-current deferred tax liability 1,200    
China [Member]      
Income Taxes [Line Items]      
Non-current deferred tax asset 422 572 773
Canada [Member]      
Income Taxes [Line Items]      
Non-current deferred tax liability $ 1,700 $ 1,500 $ 1,200
[1] Derived from audited financial statements.