Consolidated Statements of Comprehensive Loss (Current Period Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012
NET LOSS	$ (7,760)	$ (10,635)
OTHER COMPREHENSIVE (LOSS) INCOME, net of tax:
Foreign currency translation adjustment	1,385	3,495
Changes in fair value of cash flow hedges:
Portion of cash flow hedges recognized in other comprehensive income	325	(253)
OTHER COMPREHENSIVE INCOME	1,710	3,242
COMPREHENSIVE LOSS	$ (6,050)	$ (7,393)