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Earnings (Loss) Per Share (Details) (USD $) Share data in Millions, unless otherwise specified	9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 9,900,000
Participating Restricted Stock Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Undistributed Earnings Allocated to Participating Securities	$ 0.1	$ 0.1

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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