Revenue Recognition (Details) (USD $) In Millions, unless otherwise specified	Aug. 31, 2012	May 31, 2012
Revenue Recognition
Unbilled accounts receivable related to a defense supply chain support agreement	$ 30.7	$ 36.2
Cost in excess of amount billed	$ 28.9	$ 27.9

Amount included in cost of uncompleted contracts in excess of related billings, or unbilled accounts receivable, which is expected to be collected after one year from the date of the balance sheet.

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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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