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Income Taxes - Deferred Tax Assets By Location (Details) (USD $)
In Thousands, unless otherwise specified
Apr. 26, 2014
Apr. 27, 2013
Deferred Tax Assets By Location [Line Items]    
Deferred tax assets, gross $ 21,931 $ 22,188
GERMANY
    
Deferred Tax Assets By Location [Line Items]    
Deferred tax assets, gross 75 0
HONG KONG
    
Deferred Tax Assets By Location [Line Items]    
Deferred tax assets, gross 8 0
BELGIUM
    
Deferred Tax Assets By Location [Line Items]    
Deferred tax assets, gross 683 0
International
    
Deferred Tax Assets By Location [Line Items]    
Deferred tax assets, gross $ 766 $ 0