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Income Taxes (Details) (USD $) In Millions	3 Months Ended
Income Taxes (Details) (USD $) In Millions	Aug. 31, 2011
Income Taxes
Increase in unrecognized tax benefits	$ 0.2
Increase in accrued interest due to the accrual of additional tax and interest	1.2
Possible decrease in unrecognized tax benefits for the next fiscal year based on the resolution of various audits	$ 13.8

This element represents interest expense recognized for an underpayment of income taxes computed by applying the applicable statutory rate of interest to the difference between a tax position recognized for financial reporting purposes and the amount previously taken or expected to be taken in a tax return of the entity.

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