CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Common Stock and Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income [Member]
Balances at Feb. 28, 2017	$ 163,242,000	$ 211,540,000	$ (47,757,000)	$ (541,000)
Stock-based compensation expense		9,298,000
Shares issued on net share settlement of equity awards		(2,594,000)
Exercise of stock options and contributions to ESPP		330,000
Cumulative adjustment upon adoption, net of tax | ASU 2016-09 [Member]			11,681,000
Net income (loss)	16,617,000		16,617,000
Foreign currency translation adjustments, net of tax				342,000
Balances at Feb. 28, 2018	198,916,000	218,574,000	(19,459,000)	(199,000)
Equity component of 2025 Convertible Notes, net of tax		51,902,000
Purchase of capped call on 2025 Convertible Notes, net of tax		(15,870,000)
Debt issuance costs of 2025 Convertible Notes allocated to equity, net of tax		(1,649,000)
Equity component of the repurchased 2020 Convertible Notes		(6,088,000)
Unwind of note hedges and warrants of 2020 Convertible Notes		3,122,000
Stock-based compensation expense		11,029,000
Shares issued on net share settlement of equity awards		(3,603,000)
Exercise of stock options and contributions to ESPP		124,000
Repurchases of common stock	(49,000,000)	(49,000,000)
Cumulative adjustment upon adoption, net of tax | ASU 2016-01 [Member]			429,000	(429,000)
Cumulative adjustment upon adoption, net of tax | ASC 606 [Member]			(1,595,000)
Net income (loss)	18,398,000		18,398,000
Foreign currency translation adjustments, net of tax				(33,000)
Balances at Feb. 28, 2019	205,653,000	208,541,000	(2,227,000)	(661,000)
Stock-based compensation expense		12,421,000
Shares issued on net share settlement of equity awards		(2,007,000)
Exercise of stock options and contributions to ESPP		1,870,000
Net income (loss)	(79,304,000)		(79,304,000)
Foreign currency translation adjustments, net of tax				(714,000)
Balances at Feb. 29, 2020	$ 137,919,000	$ 220,825,000	$ (81,531,000)	$ (1,375,000)