DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 24, 2014	Aug. 25, 2013	May 25, 2014
Derivative Financial Instruments [Line Items]
Derivative asset prior to offsetting to total derivative	$ 0.4		$ 13.0
Derivative liability prior to offsetting to total derivative	17.6		6.8
Hedge for Anticipated Consumption of Commodity Inputs, Period	36 months
Unrealized derivative adjustments	0	45.5
Amounts representing a right to reclaim cash collateral included in prepaid expenses and other current assets			6.2
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(2.5)
Reduction of net interest expense due to impact of interest rate swap contracts	0.3
Maximum amount of loss due to the credit risk of the counterparties	18.7
Derivative Liability, Collateral, Right to Reclaim Cash, Offset	18.0
Open Commodity Purchase Contracts
Derivative Financial Instruments [Line Items]
Notional value of open commodity contracts	1,100.0		1,400.0
Open commodity sales contracts
Derivative Financial Instruments [Line Items]
Notional value of open commodity contracts	1,100.0		1,400.0
2014 Interest Rate Swap
Derivative Financial Instruments [Line Items]
Reduction of net interest expense due to impact of interest rate swap contracts	2.6
Foreign exchange contracts
Derivative Financial Instruments [Line Items]
Notional value of open commodity contracts	113.5		170.1
2043 Maturity | Cash Flow Hedging
Derivative Financial Instruments [Line Items]
Unrealized derivative adjustments		4.2
Unamortized amount of debt instruments being hedged	3.0
2023 Maturity | Cash Flow Hedging
Derivative Financial Instruments [Line Items]
Unrealized derivative adjustments		(2.0)
Unamortized amount of debt instruments being hedged	(1.4)
Selling, general and administrative expense | Interest rate contracts
Derivative Financial Instruments [Line Items]
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 2.2