Summary of Significant Accounting Policies (Details 2) (USD $) In Millions	12 Months Ended
May 29, 2011	May 30, 2010	May 31, 2009
Summary of income tax expense (benefit) on components of other comprehensive income (loss)
Net derivative adjustment	$ (4.2)	$ 0.1	$ (0.4)
Unrealized gains (losses) on available-for-sale securities	(0.1)		(0.3)
Reclassification adjustment for losses (gains) included in net income			0.2
Pension and postretirement healthcare liabilities	$ 16.3	$ (108.5)	$ (178.4)

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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Total tax effect of the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. The change includes an entity's share of an equity investee's increase or decrease in deferred hedging gains or losses. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect on reclassification adjustment for translation gains or losses realized upon the sale or complete or substantially complete liquidation of an investment in foreign entity.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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