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Income Taxes - Deferred Income Taxes - Narrative (Detail) (USD $)
Nov. 02, 2014
Apr. 27, 2014
Oct. 27, 2013
Income Taxes [Line Items]      
Current deferred tax asset $ 6,191,000 $ 6,230,000 [1] $ 7,745,000
Non-current deferred tax asset 508,000 2,040,000 [1] 661,000
Non-current deferred tax liability 1,395,000 1,013,000 [1] 5,016,000
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   1,400,000  
Non-current deferred tax liability 509,000   4,100,000
China [Member]
      
Income Taxes [Line Items]      
Current deferred tax asset 428,000 372,000 386,000
Non-current deferred tax asset 508,000 572,000 661,000
Canada [Member]
      
Income Taxes [Line Items]      
Non-current deferred tax liability $ 886,000 $ 1,000,000 $ 945,000
[1] Derived from audited financial statements.