Roll Forward of Inventory Reserves (Detail) - Inventory Valuation Reserve - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2019	Feb. 28, 2018
Inventory [Line Items]
Balance at Beginning of Period	$ 1,399	$ 1,899
Additions:Charged to Costs and Expenses	346	673
Deductions	(886)	(1,173)
Balance at End of Period	$ 859	$ 1,399