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Other Deferred Liabilities (Tables)
 12 Months Ended
May 31, 2013
Other Deferred Liabilities [Abstract]  
Summary of other deferred liabilities

Other deferred liabilities consist of the following:

 

                 
    May 31,  
    2013     2012  
    (Dollars in thousands)  

Deferred compensation expense

   $ 5,869     $ 6,011  

Accrued warranty and related expenses

     2,200       2,000  
   

 

 

    

 

 

  
    $ 8,069     $ 8,011