DERIVATIVE FINANCIAL INSTRUMENTS Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Oct. 30, 2011	Jul. 31, 2011	Oct. 31, 2010	Oct. 30, 2011	Oct. 31, 2010
Derivative [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 36.2			$ 36.2
Derivative, Collateral, Obligation to Return Cash	3.7			3.7
Credit Exposure on Non-Exchange Traded Derivative Contracts, Excluding the Effects of Netting Arrangements	22.2			22.2
Credit Exposure on Non-Exhange Traded Derivative Contracts, Including the Effects of Netting Arrangements	12.6			12.6
Gain (Loss) Recognized in Income as a Result of Cash Flow Hedge De-Designation		12.0
Deferred Net Gain (Losses) in Accumulated Other Comprehensive Income (Loss)	9.4			9.4
Tax On Deferred Gains (Losses) in Accumulated Other Comprehensive Income (Loss)	(7.1)			(7.1)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months				11.8
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months, Net of Tax				7.2
Gains (Losses) Recognized on Closed Commodity Derivative Contracts As the Underlying Cash Transactions Affected Earnings	(1.2)		2.3	4.7	(19.8)
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			$ (6.3)	$ 5.7	$ 2.4