Amounts Recognized In Other Comprehensive Income, and Reclassified Into Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income	$ (536)	$ 1,315	$ (648)	$ 1,281
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	(536)	1,315	(648)	1,281
Gain (Loss) Reclassified from Other Comprehensive Income to Earnings