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DERIVATIVE FINANCIAL INSTRUMENTS Narrative (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 27, 2013
Jan. 29, 2012
Jan. 27, 2013
Jan. 29, 2012
Derivative [Line Items]        
Derivative, Collateral, Right to Reclaim Cash $ 20.2   $ 20.2  
Derivative, Collateral, Obligation to Return Cash 0.9   0.9  
Credit Exposure on Non-Exchange Traded Derivative Contracts, Excluding the Effects of Netting Arrangements 23.4   23.4  
Credit Exposure on Non-Exhange Traded Derivative Contracts, Including the Effects of Netting Arrangements 2.5   2.5  
Gain (Loss) Recognized in Income as a Result of Cash Flow Hedge De-Designation       12.0
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 41.9   41.9  
Tax On Deferred Gains (Losses) in Accumulated Other Comprehensive Income (Loss) 26.3   26.3  
Gains (Losses) Recognized on Closed Commodity Derivative Contracts As the Underlying Cash Transactions Affected Earnings (6.9) (0.2) (2.4) 4.5
Gains (Losses) on Derivative Contracts Representing the Differences Between Spot and Futures Prices Which are Excluded from the Assessment of Effectiveness and Recorded Directly Into Earnings   0.3 (7.5) 6.0
Scenario, Forecast [Member] | Commodity Contract [Member]
        
Derivative [Line Items]        
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months 43.2      
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax $ 26.4