Noncontrolling Interests (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Aug. 31, 2012	Aug. 31, 2011
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Beginning balance	$ 144,422	$ 133,858
Net income attributable to redeemable noncontrolling interest	1,814	2,605
Foreign currency translation adjustment	573	132
Change in the maximum redemption amount of redeemable noncontrolling interest	(817)	1,842
Derecognition of redeemable noncontrolling interest (See Note 12)	(145,992)	0
Ending balance	$ 0	$ 138,437

- Definition

The carrying value (book value) of an entity's issued and outstanding stock which is not included within permanent equity in Stockholders Equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.

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