Inventories - Additional Information (Detail) - USD ($)	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015
Inventory [Line Items]
Disposal of Inventory		$ 300,000
Inventory reserve	$ 1,270,000	493,000
Clinton settlement
Inventory [Line Items]
Disposal of Inventory	100,000	300,000
Inventory reserve	$ 100,000	$ 0