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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
 12 Months Ended
May. 31, 2015
May. 31, 2014
Other Liabilities Disclosure [Abstract]    
Deferred compensation expense $ 5,237 $ 5,386
Accrued warranty and related expenses 2,400 2,000
Total other deferred liabilities 7,637 7,386
Life insurance loans 4,312 6,334
Total $ 11,949 $ 13,720