Schedule II-Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 1,531	$ 2,134	$ 1,252
Charged to costs and expenses	586	289	885
Bad debt write-offs	(99)	(892)	(3)
Ending balance	2,018	1,531	2,134
Sales Return Reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	1,849	1,862	2,371
Charged to deferred revenue	25,340	18,151	16,901
Sales returns	(25,163)	(18,164)	(17,410)
Ending balance	$ 2,026	$ 1,849	$ 1,862