CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balances at Feb. 28, 2015	$ 151,385	$ 362	$ 207,881	$ (56,793)	$ (65)
Balances (in shares) at Feb. 28, 2015		36,225
Net income (loss)	16,940			16,940
Stock-based compensation expense	5,854		5,854
Equity component of convertible senior notes, net of tax	20,104		20,104
Purchase of note hedges, net of tax	(19,324)		(19,324)
Sale of warrants to note hedge counterparties	15,991		15,991
Foreign currency translation adjustments	(161)
Issuance of shares for restricted stock awards		$ 1	(1)
Issuance of shares for restricted stock awards (in shares)		115
Shares issued on net share settlement of equity awards	(2,625)	$ 1	(2,626)
Shares issued on net share settlement of equity awards (in shares)		99
Exercise of stock options	$ 1,283	$ 3	1,280
Exercise of stock options (in shares)	228	228
Other comprehensive income (loss), net of tax	$ (161)				(161)
Balances at Feb. 29, 2016	189,447	$ 367	229,159	(39,853)	(226)
Balances (in shares) at Feb. 29, 2016		36,667
Net income (loss)	(7,904)			(7,904)
Stock-based compensation expense	7,833		7,833
Foreign currency translation adjustments	(280)
Issuance of shares for restricted stock awards		$ 1	(1)
Issuance of shares for restricted stock awards (in shares)		149
Shares issued on net share settlement of equity awards	(1,780)	$ 2	(1,782)
Shares issued on net share settlement of equity awards (in shares)		150
Exercise of stock options	$ 961	$ 1	960
Exercise of stock options (in shares)	125	125
Repurchase of common stock	$ (25,000)	$ (18)	(24,982)
Repurchase of common stock (in shares)		(1,761)
Other comprehensive income (loss), net of tax	(315)				(315)
Balances at Feb. 28, 2017	163,242	$ 353	211,187	(47,757)	(541)
Balances (in shares) at Feb. 28, 2017		35,330
Net income (loss)	16,617			16,617
Cumulative adjustment uponadoption of ASU 2016-09(Note 1)	11,681			11,681
Stock-based compensation expense	9,298		9,298
Foreign currency translation adjustments	(122)
Issuance of shares for restricted stock awards		$ 1	(1)
Issuance of shares for restricted stock awards (in shares)		107
Shares issued on net share settlement of equity awards	(2,594)	$ 2	(2,596)
Shares issued on net share settlement of equity awards (in shares)		141
Exercise of stock options	$ 330	$ 1	329
Exercise of stock options (in shares)	140	140
Other comprehensive income (loss), net of tax	$ 342				342
Balances at Feb. 28, 2018	$ 198,916	$ 357	$ 218,217	$ (19,459)	$ (199)
Balances (in shares) at Feb. 28, 2018		35,718