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Income Taxes - Deferred Income Taxes - Narrative (Detail) (USD $)
Aug. 03, 2014
Apr. 27, 2014
Jul. 28, 2013
Income Taxes [Line Items]      
Current deferred tax asset $ 6,203,000 $ 6,230,000 [1] $ 7,747,000
Non-current deferred tax asset 973,000 2,040,000 [1] 651,000
Non-current deferred tax liability 1,013,000 1,013,000 [1] 4,335,000
U.S. Tax Authorities [Member]
      
Income Taxes [Line Items]      
Current deferred tax asset 5,800,000 5,800,000 7,400,000
Non-current deferred tax asset 440,000 1,400,000  
Non-current deferred tax liability     3,200,000
China [Member]
      
Income Taxes [Line Items]      
Current deferred tax asset 405,000 372,000 302,000
Non-current deferred tax asset 533,000 572,000 651,000
Canada [Member]
      
Income Taxes [Line Items]      
Non-current deferred tax liability $ 1,000,000 $ 1,000,000 $ 1,100,000
[1] Derived from audited financial statements.