Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
Net income (loss)	$ 429	$ (2,658)
Other comprehensive income
Unrealized actuarial gains (losses) of defined benefit plans net of tax expense (benefit) or $0 and $(32), respectively	0	(55)
Reclassification adjustment for losses (gains) of defined benefit plans net of tax expense (benefit) or $6 and $244, respectively	9	423
Total other comprehensive income	9	368
Comprehensive income (loss)	$ 438	$ (2,290)