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Warranty
3 Months Ended
Aug. 31, 2011
Warranty [Abstract]  
Warranty
NOTE 4 Warranty
A reconciliation of accrued warranty and related expenses is as follows:
                 
    Three-Months Ended  
    August 31,  
    2011     2010  
    (Dollars in thousands)  
 
               
Balance at the beginning of the period
  $ 4,966     $ 4,839  
Accruals for warranties
    1,355       1,311  
Settlements made during the period
    (1,330 )     (1,300 )
 
           
Balance at the end of the period
    4,991       4,850  
 
               
Non-current balance included in other deferred liabilities
    1,600       1,500  
 
           
 
               
Accrued warranty and related expenses
  $ 3,391     $ 3,350