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Note 13 - Share-Based Compensation (Detail) - Share-Based Compensation (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Aug. 19, 2011	Feb. 29, 2012	Feb. 28, 2013
Share-based compensation	$ 311	$ 314	$ 16,233	$ 314	$ 1,167
Tax benefit	(121)	(122)	(5,682)	(122)	(454)
Share-based compensation, net	$ 190	$ 192	$ 10,551	$ 192	$ 713

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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