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Summary of Significant Accounting Policies - Foreign Currency Translation and PPE (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 03, 2015
Apr. 27, 2014
Apr. 28, 2013
Accounting Policies [Abstract]      
Gains (losses) on foreign currency transactions $ (479)us-gaap_ForeignCurrencyTransactionGainLossRealized $ (2,500)us-gaap_ForeignCurrencyTransactionGainLossRealized $ (861)us-gaap_ForeignCurrencyTransactionGainLossRealized
Minimum      
Property, Plant and Equipment [Line Items]      
Estimated useful life (property, equipment and improvements) 3 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Estimated useful life (property, equipment and improvements) 7 years    
Land, Buildings and Improvements      
Property, Plant and Equipment [Line Items]      
Estimated useful life (property, equipment and improvements) 25 years