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Warranty (Tables)
12 Months Ended
May. 31, 2015
Guarantees [Abstract]  
Reconciliation of Accrued Warranty and Related Expenses

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

 

     Year ended May 31,  
     2015      2014  
     (Dollars in thousands)  

Balance at the beginning of the period

   $ 5,697       $ 5,882   

Accruals for warranties

     8,395         5,224   

Settlements made during the period

     (7,181      (5,409
  

 

 

    

 

 

 

Balance at the end of the period

     6,911         5,697   

Non-current balance included in other deferred liabilities

     2,400         2,000   
  

 

 

    

 

 

 

Accrued warranty and related expenses

   $ 4,511       $ 3,697