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Summary of Significant Accounting Policies (Details 8) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2012	May 31, 2011	May 31, 2010
Repurchase of treasury shares	$ 3,659	$ 2,539
Impact of net share settlements of bond hedge and warrants	(53)	(236)	(252)
Treasury Stock
Total increase (decrease) in treasury stock	(10,027)	(4,016)	1,288
Change in treasury stock due to restricted stock awards and exercise of stock options, net of shares withheld to satisfy statutory tax obligations	13,730	6,692	(950)
Repurchase of treasury shares	3,659	2,539
Impact of net share settlements of bond hedge and warrants	$ (44)	$ (137)	$ (338)

Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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