Amounts in Accumulated Other Comprehensive Income (Loss) that have not yet been Recognized in Net Periodic Pension Cost, but will be Recognized in Consolidated Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014
Pension Benefits, U.S. Plans
Schedule of Pension Amounts in Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial loss	$ (13,413)
Prior service (costs)	(294)
Pension Benefits, Non-U.S. Plans
Schedule of Pension Amounts in Accumulated Other Comprehensive Income (Loss) [Line Items]
Net actuarial loss	(1,947)
Prior service (costs)	$ (41)