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Earnings (Loss) Per Share (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended | 42 Months Ended
--- | --- | ---
Feb. 28, 2014 | Feb. 28, 2013 | Feb. 28, 2014
Earnings Per Share [Abstract] |  |  |
Undistributed Earnings Allocated to Participating Securities | $ 0.1 | $ 0.1 |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 13.4 |  | $ 13.4

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- Definition Amount remaining of a stock repurchase plan authorized by an entity's Board of Directors. + References No definition available. + Details
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- Definition Earnings allocated (not distributed) to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed. + References No definition available. + Details
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