Schedule II-Valuation and Qualifying Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Allowance for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 2,018	$ 1,531	$ 2,134
Charged to costs and expenses	839	586	289
Bad debt write-offs	0	(99)	(892)
Ending balance	2,857	2,018	1,531
Sales Return Reserve
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	2,026	1,849	1,862
Charged to deferred revenue	22,162	25,340	18,151
Sales returns	(22,373)	(25,163)	(18,164)
Ending balance	$ 1,815	$ 2,026	$ 1,849