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PENSION AND OTHER RETIREMENT PLANS Schedule of Qualified Pension Plan Assets by Major Asset Category (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 28, 2013
Apr. 29, 2012
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 1,110.6 $ 1,023.5
Cash and Cash Equivalents, Net of Unsettled Transactions [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 0.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 4.00%  
Fair value of plan assets 45.3 24.7
Equity Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 30.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 50.00%  
Fair value of plan assets 411.3 427.0
Debt Securities [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 35.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 55.00%  
Fair value of plan assets 555.6 495.2
Alternative Assets [Member]
   
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Target Plan Asset Allocations Range Minimum 5.00%  
Defined Benefit Plan, Target Plan Asset Allocations Range Maximum 20.00%  
Fair value of plan assets $ 98.4 $ 76.6