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Warranty (Tables)
 9 Months Ended
Feb. 28, 2013
Warranty and Commitments and Contingencies [Abstract]  
Reconciliation of accrued warranty and related expenses

A reconciliation of accrued warranty and related expenses is as follows:

 

                 
    Nine-Months Ended  
    February 28,
2013		     February 29,
2012		  
    (Dollars in thousands)  

Balance at the beginning of the period

   $ 5,870     $ 4,966  

Accruals for warranties

     4,403       4,429  

Settlements made during the period

     (3,890 )      (3,906 ) 
   

 

 

    

 

 

  

Balance at the end of the period

     6,383       5,489  

Non-current balance included in other deferred liabilities

     2,000       1,600  
   

 

 

    

 

 

  

Accrued warranty and related expenses

   $ 4,383     $ 3,889