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Accounting Policies (Details)
 12 Months Ended
Apr. 25, 2015
Apr. 26, 2014
Apr. 27, 2013
Accounting Policies      
Length of fiscal year 364 days 364 days 364 days
Inventories      
Inventory cost determined using LIFO basis (as a percent) 66.00%us-gaap_PercentageOfLIFOInventory 67.00%us-gaap_PercentageOfLIFOInventory  
Computer software costs | Minimum      
Property, Plant and Equipment      
Estimated useful life 3 years    
Computer software costs | Maximum      
Property, Plant and Equipment      
Estimated useful life 10 years