Derivative Financial Instruments (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 27, 2012	May 29, 2011	May 30, 2010
Allocation of net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk
Total gain from derivative instruments not designated as hedging instruments	$ 66.1	$ 32.1	$ 152.1
Commodity Contracts [Member] | Cost of goods sold [Member]
Allocation of net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk
Total gain from derivative instruments not designated as hedging instruments	52.1	58.1	149.0
Commodity Contracts [Member] | Selling, general and administrative expenses [Member]
Allocation of net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk
Total gain from derivative instruments not designated as hedging instruments	(0.1)	2.1
Foreign Exchange Contracts [Member] | Cost of goods sold [Member]
Allocation of net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk
Total gain from derivative instruments not designated as hedging instruments	5.4	(20.2)	0.5
Foreign Exchange Contracts [Member] | Selling, general and administrative expenses [Member]
Allocation of net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk
Total gain from derivative instruments not designated as hedging instruments	8.7	(7.9)
Others [Member] | Selling, general and administrative expenses [Member]
Allocation of net derivative gains (losses) from economic hedges of forecasted commodity consumption and the foreign currency risk
Total gain from derivative instruments not designated as hedging instruments			$ 2.6