CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]
Balances at Feb. 29, 2016	$ 189,447,000	$ 367,000	$ 229,159,000	$ (39,853,000)	$ (226,000)
Balances (in shares) at Feb. 29, 2016		36,667,000
Net income (loss)	(7,904,000)			(7,904,000)
Stock-based compensation expense	7,833,000		7,833,000
Issuance of shares for restricted stock awards		$ 1,000	(1,000)
Issuance of shares for restricted stock awards (in shares)		149,000
Shares issued on net share settlement of equity awards	(1,780,000)	$ 2,000	(1,782,000)
Shares issued on net share settlement of equity awards (in shares)		150,000
Exercise of stock options	$ 961,000	$ 1,000	960,000
Exercise of stock options (in shares)	125,000	125,000
Repurchase of common stock	$ (25,000,000)	$ (18,000)	(24,982,000)
Repurchase of common stock (in shares)	(1,760,563)	(1,761,000)
Other comprehensive income (loss), net of tax	$ (315,000)				(315,000)
Balances at Feb. 28, 2017	163,242,000	$ 353,000	211,187,000	(47,757,000)	(541,000)
Balances (in shares) at Feb. 28, 2017		35,330,000
Net income (loss)	16,617,000			16,617,000
Cumulative adjustment upon adoption, net of tax | ASU 2016-09 [Member]	11,681,000			11,681,000
Stock-based compensation expense	9,298,000		9,298,000
Issuance of shares for restricted stock awards		$ 1,000	(1,000)
Issuance of shares for restricted stock awards (in shares)		107,000
Shares issued on net share settlement of equity awards	(2,594,000)	$ 2,000	(2,596,000)
Shares issued on net share settlement of equity awards (in shares)		141,000
Exercise of stock options	$ 330,000	$ 1,000	329,000
Exercise of stock options (in shares)	140,000	140,000
Other comprehensive income (loss), net of tax	$ 342,000				342,000
Balances at Feb. 28, 2018	198,916,000	$ 357,000	218,217,000	(19,459,000)	(199,000)
Balances (in shares) at Feb. 28, 2018		35,718,000
Net income (loss)	18,398,000			18,398,000
Cumulative adjustment upon adoption, net of tax | ASC 606 [Member]	(1,595,000)			(1,595,000)
Cumulative adjustment upon adoption, net of tax | ASU 2016-01 [Member]				429,000	(429,000)
Purchase of capped call of 2025 Convertible Notes, net of tax	(15,870,000)		(15,870,000)
Equity component of 2025 Convertible Notes, net of tax	51,902,000		51,902,000
Debt issuance costs allocated to equity component of 2025 Convertible Notes, net of tax	(1,649,000)		(1,649,000)
Unwind of note hedges and warrants of 2020 Convertible Notes	3,122,000		3,122,000
Equity component of the repurchased 2020 Convertible Notes	(6,088,000)		(6,088,000)
Stock-based compensation expense	11,029,000		11,029,000
Issuance of shares for restricted stock awards		$ 1,000	(1,000)
Issuance of shares for restricted stock awards (in shares)		84,000
Shares issued on net share settlement of equity awards	(3,603,000)	$ 2,000	(3,605,000)
Shares issued on net share settlement of equity awards (in shares)		183,000
Exercise of stock options	$ 124,000	$ 1,000	123,000
Exercise of stock options (in shares)	66,000	66,000
Repurchase of common stock	$ (49,000,000)	$ (25,000)	(48,975,000)
Repurchase of common stock (in shares)	(2,496,422)	(2,496,000)
Other comprehensive income (loss), net of tax	$ (33,000)				(33,000)
Balances at Feb. 28, 2019	$ 205,653,000	$ 336,000	$ 208,205,000	$ (2,227,000)	$ (661,000)
Balances (in shares) at Feb. 28, 2019		33,555,000