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Fair Value (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 26, 2015
Apr. 27, 2014
Assets, Fair Value Disclosure [Abstract]    
Property and equipment, net impairment charges $ 9,000us-gaap_TangibleAssetImpairmentCharges $ 16,122us-gaap_TangibleAssetImpairmentCharges
Nonrecurring    
Assets, Fair Value Disclosure [Abstract]    
Property and equipment, net impairment charges 9,000us-gaap_TangibleAssetImpairmentCharges
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember		  
Nonrecurring | Level 3    
Assets, Fair Value Disclosure [Abstract]    
Property, Plant, and Equipment, Fair Value Disclosure $ 15,848us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FairValueByMeasurementFrequencyAxis
= us-gaap_FairValueMeasurementsNonrecurringMember