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Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 26, 2014
Week
Apr. 27, 2013
Week
Apr. 28, 2012
Week
Accounting Policies [Abstract]      
Number of weeks in fiscal year 52 52 52
Inventories [Abstract]      
Percent of LIFO Inventory (in hundredths) 67.00% 67.00%  
Research and Development Costs [Abstract]      
Research and Development cost $ 7.9 $ 7.2 $ 7.3
Advertising Expenses [Abstract]      
Gross advertising expenses 59.6 53.9 47.7
Percent of Reimbursement on Advertisement (in hundredths) 34.60%    
Insurance/Self- Insurance [Abstract]      
Maximum deductibles for insurance arrangement $ 1.5    
Computer Software Costs [Member] | Minimum [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life 3 years    
Computer Software Costs [Member] | Maximum [Member]
     
Property, Plant and Equipment [Line Items]      
Estimated useful life 10 years