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Warranty Reserves (Tables)
 6 Months Ended
Aug. 31, 2017
Product Warranties Disclosures [Abstract]  
Changes in the warranty reserves
The following table shows changes in the warranty reserves since the end of fiscal 2017:
 
 
Warranty Reserve
 
(unaudited)
 
(in thousands)
Balance at February 28, 2017
$
2,098

Warranty costs incurred
(993
)
Additions charged to income
695

Balance at August 31, 2017
$
1,800