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Fair Value Measurements (Details 2) (USD $) In Millions, unless otherwise specified	Feb. 28, 2013	May 31, 2012
Fair Value Disclosures [Abstract]
Amortized cost basis, marketable securities	$ 28.2	$ 0

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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