CONDENSED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - 6 months ended Aug. 31, 2018 - 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, 2018	$ 198,916	$ 357	$ 218,217	$ (19,459)	$ (199)
Balances (in shares) at Feb. 28, 2018		35,718
Cumulative adjustment upon adoption, net of tax | ASU 2016-01 [Member]				434	(434)
Cumulative adjustment upon adoption, net of tax | ASC 606 [Member]	(1,595)			(1,595)
Net income (loss)	7,657			7,657
Equity component of 2025 Convertible Notes, net of tax	51,902		51,902
Purchase of capped call on 2025 Convertible Notes, net of tax	(15,870)		(15,870)
Debt issuance costs of 2025 Convertible Notes allocated to equity, net of tax	(1,649)		(1,649)
Equity component of the repurchased 2020 Convertible Notes	(6,088)		(6,088)
Unwind of note hedges and warrants of 2020 Convertible Notes, net of tax	3,122		3,122
Stock-based compensation expense	5,147		5,147
Shares issued on net share settlement of equity awards	(3,346)	$ 2	(3,348)
Shares issued on net share settlement of equity awards (in shares)		156
Issuance of shares for restricted stock awards		$ 1	(1)
Issuance of shares for restricted stock awards, (in shares)		84
Exercise of stock options	$ 101	$ 1	100
Exercise of stock options (in shares)	55	55
Other comprehensive income, net of tax	$ 3				3
Repurchases of common stock	(28,564)	$ (13)	(28,551)
Repurchase of common stock (in shares)		(1,255)
Balances at Aug. 31, 2018	$ 209,736	$ 348	$ 222,981	$ (12,963)	$ (630)
Balances (in shares) at Aug. 31, 2018		34,758