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Long-Term Liabilities - Summary of Long-Term Liabilities Consisting of Other Deferred Liabilities and Life Insurance Loans (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
Other Liabilities Disclosure [Abstract]    
Deferred compensation expense $ 5,386 $ 5,869
Accrued warranty and related expenses 2,000 2,200
Total other deferred liabilities 7,386 8,069
Life insurance loans 6,334  
Total $ 13,720 $ 8,069