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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Aug. 31, 2012
Income Tax Disclosure [Abstract]
Unrecognized Tax Benefits, Increases Resulting from Current Period Tax Positions	$ 0.4
Unrecognized tax benefits, increase (decrease) in accrued interest	0.1
Unrecognized tax benefits could decrease by approximately	$ 3.7

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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