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Reconciliation of Changes in Warranty Reserve (Detail) - USD ($)
$ in Thousands
12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Warranty Liability [Line Items]    
Balance at beginning of year $ 127 $ 127
Reduction in provision based on current year sales activity, net (77) 54
Warranty costs incurred (13) (54)
Balance at end of year $ 37 $ 127