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Revenue Recognition (Details) (USD $) In Thousands, unless otherwise specified	Feb. 29, 2012	May 31, 2011
Revenue Recognition
Unbilled accounts receivable related to a defense supply chain support agreement	$ 35,771	$ 28,867
Cost in excess of amount billed	$ 33,684	$ 19,404

Unbilled amounts due for services rendered or to be rendered, actions taken or to be taken, or a promise to refrain from taking certain actions in accordance with the terms of a legally binding agreement between the entity and, at a minimum, one other party. An example would be amounts associated with contracts or programs where the recognized revenue for performance thereunder exceeds the amounts billed under the terms thereof as of the date of the balance sheet.

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