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Warranty (Tables)
3 Months Ended
Aug. 31, 2012
Warranty and Commitments and Contingencies [Abstract]  
Reconciliation of accrued warranty and related expenses
                 
    Three-Months Ended
August 31,
 
    2012     2011  
    (Dollars in thousands)  

Balance at the beginning of the period

  $ 5,870     $ 4,966  

Accruals for warranties

    1,685       1,355  

Settlements made during the period

    (1,357     (1,330
   

 

 

   

 

 

 

Balance at the end of the period

    6,198       4,991  
     

Non-current balance included in other deferred liabilities

    2,000       1,600  
   

 

 

   

 

 

 

Accrued warranty and related expenses

  $ 4,198     $ 3,391