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Consolidated Statements Of Comprehensive Loss (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Unrealized actuarial gains (losses) of defined benefit plans, tax	$ 3,126	$ 1,568	$ 102
Reclassification adjustment for losses (gains) benefit plans, tax	$ 409	$ (200)	$ 697

Tax effect of the increase (decrease) in the value of the projected benefit obligation and the (increase) decrease in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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