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Fair Value Measurements (Detail) - USD ($)
$ in Thousands
Aug. 31, 2015
May. 31, 2015
Assets    
Supplemental executive retirement plan $ 3,218 $ 3,521
Fair Value, Measurements, Recurring    
Assets    
Total assets measured at fair value 3,228 3,521
Liabilities    
Supplemental executive retirement plan liabilities 3,218 3,521
Total liabilities measured at fair value 3,218 3,537
Fair Value, Measurements, Recurring | Foreign exchange forward contracts    
Assets    
Foreign exchange forward contracts 10  
Liabilities    
Foreign exchange forward contracts   16
Fair Value, Measurements, Recurring | Money market funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan 166 166
Fair Value, Measurements, Recurring | Mutual funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan 3,052 3,355
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1)    
Assets    
Total assets measured at fair value 3,218 3,521
Liabilities    
Supplemental executive retirement plan liabilities 3,218 3,521
Total liabilities measured at fair value 3,218 3,521
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Foreign exchange forward contracts    
Assets    
Foreign exchange forward contracts 0  
Liabilities    
Foreign exchange forward contracts   0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Money market funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan 166 166
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Instruments (Level 1) | Mutual funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan 3,052 3,355
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Assets    
Total assets measured at fair value 10 0
Liabilities    
Supplemental executive retirement plan liabilities 0 0
Total liabilities measured at fair value 0 16
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange forward contracts    
Assets    
Foreign exchange forward contracts 10  
Liabilities    
Foreign exchange forward contracts   16
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Money market funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan 0 0
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Assets    
Total assets measured at fair value 0 0
Liabilities    
Supplemental executive retirement plan liabilities 0 0
Total liabilities measured at fair value 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange forward contracts    
Assets    
Foreign exchange forward contracts 0  
Liabilities    
Foreign exchange forward contracts   0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Money market funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan 0 0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds | Supplemental executive retirement plan    
Assets    
Supplemental executive retirement plan $ 0 $ 0