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Components of Net Postretirement Expense (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
May 31, 2014
May 31, 2013
May 31, 2012
Postretirement Benefits, U.S. Plans
     
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Interest cost on the accumulated obligation $ 297 $ 349 $ 416
Prior service (credit) (153) (86) (86)
Net actuarial (gains) losses (144) 16 (58)
Net Pension Cost   279 272
Postretirement Benefits, Non-U.S. Plans
     
Pension and Other Postretirement Benefits Disclosure [Line Items]      
Service cost - Benefits earned during the period 1,264 1,185 745
Interest cost on the accumulated obligation 1,225 1,188 968
Net actuarial (gains) losses 516 470 72
Net Pension Cost $ 3,005 $ 2,843 $ 1,785