Amounts Recognized In Other Comprehensive Income, and Reclassified Into Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income	$ (143)	$ (117)	$ (791)	$ 1,164
Gain (Loss) Reclassified from Other Comprehensive Income to Earnings
Euro denominated long-term debt
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income	(143)	(117)	(791)	1,164
Gain (Loss) Reclassified from Other Comprehensive Income to Earnings