Inventories - Additional Information (Detail) (USD $)	12 Months Ended
	Feb. 28, 2015	Feb. 28, 2014
Inventory [Line Items]
Disposal of Inventory	$ 300,000	$ 1,800,000
Inventory reserve	493,000	111,000
Clinton settlement
Inventory [Line Items]
Disposal of Inventory	300,000	5,300,000
Inventory reserve	$ 0	$ 3,200,000