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Earnings (Loss) Per Share (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Earnings (Loss) Per Share (Details) [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	2,083,054	3,962,650	4,341,331
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	4,185,480	4,948,075
Stock Repurchase Program, Remaining Authorized Repurchase Amount (in Dollars)	$ 19.6
Participating Restricted Stock Units [Member]
Earnings (Loss) Per Share (Details) [Line Items]
Undistributed Earnings Allocated to Participating Securities (in Dollars)	$ 0.1	$ 0.5	$ 0.3

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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