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Warranty Reserves (Tables)
3 Months Ended
May 31, 2020
Product Warranties Disclosures [Abstract]  
Changes in the warranty reserves
The following table shows the changes in the warranty reserves for the three months ended May 31, 2020 (in thousands):
 
Beginning of period$3,702  
Warranty costs incurred(509) 
Additions charged to income327  
End of period$3,520