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Fair Value Measurements (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2014
May 31, 2013
ASSETS    
Supplemental executive retirement plan $ 3,354 $ 2,947
Fair Value, Measurements, Recurring
   
ASSETS    
Total assets measured at fair value 3,354 3,075
Liabilities    
Total liabilities measured at fair value 25  
Fair Value, Measurements, Recurring | Money market funds
   
ASSETS    
Money market funds 0 14
Fair Value, Measurements, Recurring | Money market funds | Supplemental executive retirement plan
   
ASSETS    
Supplemental executive retirement plan 362 113
Fair Value, Measurements, Recurring | Mutual funds | Supplemental executive retirement plan
   
ASSETS    
Supplemental executive retirement plan 2,992 2,834
Fair Value, Measurements, Recurring | Foreign exchange forward contracts
   
ASSETS    
Foreign exchange forward contracts   114
Liabilities    
Foreign exchange forward contracts 25  
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring
   
ASSETS    
Total assets measured at fair value 3,354 2,961
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Money market funds
   
ASSETS    
Money market funds 0 14
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Money market funds | Supplemental executive retirement plan
   
ASSETS    
Supplemental executive retirement plan 362 113
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Mutual funds | Supplemental executive retirement plan
   
ASSETS    
Supplemental executive retirement plan 2,992 2,834
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
   
ASSETS    
Total assets measured at fair value 0 114
Liabilities    
Total liabilities measured at fair value 25  
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Foreign exchange forward contracts
   
ASSETS    
Foreign exchange forward contracts   114
Liabilities    
Foreign exchange forward contracts $ 25