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Warranty - Reconciliation of Accrued Warranty and Related Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
May 31, 2014
May 31, 2013
Guarantees [Abstract]    
Balance at the beginning of the period $ 5,882 $ 5,870
Accruals for warranties 5,224 5,191
Settlements made during the period (5,409) (5,179)
Balance at the end of the period 5,697 5,882
Non-current balance included in other deferred liabilities 2,000 2,200
Accrued warranty and related expenses $ 3,697 $ 3,682