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Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2013
May 31, 2013
ASSETS    
Supplemental executive retirement plan $ 3,285 $ 2,947
Fair Value, Measurements, Recurring
   
ASSETS    
Total assets measured at fair value 3,299 3,075
Liabilities    
Total liabilities measured at fair value 66  
Fair Value, Measurements, Recurring | Money market funds
   
ASSETS    
Money market funds 14 14
Fair Value, Measurements, Recurring | Money market funds | Supplemental executive retirement plan
   
ASSETS    
Supplemental executive retirement plan 135 113
Fair Value, Measurements, Recurring | Mutual Funds | Supplemental executive retirement plan
   
ASSETS    
Supplemental executive retirement plan 3,150 2,834
Fair Value, Measurements, Recurring | Foreign exchange forward contracts
   
ASSETS    
Foreign exchange forward contracts   114
Liabilities    
Foreign exchange forward contracts 66  
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring
   
ASSETS    
Total assets measured at fair value 3,299 2,961
Quoted Prices in Active Markets for Identical Instruments (Level 1) | Fair Value, Measurements, Recurring | Money market funds
   
ASSETS    
Money market funds 14 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 135 113
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 3,150 2,834
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
   
ASSETS    
Total assets measured at fair value   114
Liabilities    
Total liabilities measured at fair value 66  
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 $ 66