Reconciliation of Changes in Warranty Reserve (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017
Warranty Liability [Line Items]
Balance at beginning of year	$ 127	$ 125
Provision for current year sales	54	148
Warranty costs incurred	(54)	(146)
Balance at end of year	$ 127	$ 127