Schedule of Derivative Instruments in Statement of Financial Position, Gross, Fair Value (Detail) (USD $) In Millions, unless otherwise specified	Aug. 26, 2012	May 27, 2012
Derivatives, Fair Value [Line Items]
Total derivative assets not designated as hedging instruments	$ 123.0	$ 68.2
Total derivative assets	123.0	68.2
Total derivative liabilities not designated as hedging instruments	71.6	84.2
Total derivative liabilities	229.9	238.1
Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Total derivative liabilities	158.3	153.9
Interest rate contracts | Other accrued liabilities | Designated as hedging instrument
Derivatives, Fair Value [Line Items]
Total derivative liabilities	158.3	153.9
Commodity contracts | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Total derivative liabilities not designated as hedging instruments	59.2	75.6
Commodity contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Total derivative assets not designated as hedging instruments	121.8	60.3
Foreign exchange contracts | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Total derivative liabilities not designated as hedging instruments	12.0	8.1
Foreign exchange contracts | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Total derivative assets not designated as hedging instruments	0.9	7.3
Other | Other accrued liabilities
Derivatives, Fair Value [Line Items]
Total derivative liabilities not designated as hedging instruments	0.4	0.5
Other | Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Total derivative assets not designated as hedging instruments	$ 0.3	$ 0.6