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Consolidated Statements of Comprehensive Loss (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Statement of Other Comprehensive Income [Abstract]
Unrealized actuarial loss of defined benefit plans, tax	$ 0	$ 0	$ 0	$ (32)
Reclassification of actuarial loss of defined benefit plans, tax	$ (8)	$ (55)	$ (12)	$ 298

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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