Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2017	Feb. 29, 2016	Feb. 28, 2015
Statement of Cash Flows [Abstract]
Net income (loss)	$ 10,235	$ (4,422)	$ (67,498)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, amortization and impairment expense	16,431	13,300	8,631
Stock-based compensation expense	32,705	28,846	17,058
Excess tax benefits from equity compensation plans	(1,909)	(3,788)	(8,947)
Deferred income taxes	1,642	(6,592)	59,261
Other	(493)	(865)	486
Changes in operating assets and liabilities:
Accounts receivable, net	(4,103)	4,427	(12,945)
Inventories, net	(202)	(1,193)	1,189
Income taxes, net	1,931	2,756	(485)
Deferred costs	(725)	(1,112)	(8,189)
Other assets	(888)	(2,187)	(2,158)
Accounts payable	(5,388)	(720)	2,835
Accrued payroll and related benefits	1,033	3,339	1,959
Other liabilities	397	(1,526)	3,566
Deferred revenue	14,537	19,003	59,341
Net cash provided by operating activities	65,203	49,266	54,104
Investing activities
Purchases of marketable securities	(74,527)	(26,021)	(41,977)
Proceeds from the sale of marketable securities	13,461	10,310	249
Proceeds from maturity of marketable securities	17,597	20,047	735
Purchases of non-marketable investments	(1,236)	(1,400)	(1,200)
Purchases of property and equipment	(6,335)	(7,818)	(12,517)
Purchases of intangible assets	(1,374)	0	(38)
Business combinations, net of cash acquired	(6,950)	(56,862)	(4,791)
Net cash used in investing activities	(59,364)	(61,744)	(59,539)
Financing activities
Proceeds from issuance of common stock	8,899	4,845	16,476
Taxes paid related to net share settlement of equity awards	(7,061)	(6,734)	(5,369)
Repurchases of common stock	(7,596)	(19,216)	0
Excess tax benefits from equity compensation plans	1,909	3,788	8,947
Repayment of employee loans, net of loans extended	0	(2,464)	1,921
Repayment of note payable	(268)	(285)	(237)
Other	0	(330)	(34)
Net cash provided by (used in) financing activities	(4,117)	(20,396)	21,704
Effect of exchange rate changes on cash and cash equivalents	(182)	155	(775)
Net increase (decrease) in cash and cash equivalents	1,540	(32,719)	15,494
Cash and cash equivalents at beginning of period	118,654	151,373	135,879
Cash and cash equivalents at end of period	120,194	118,654	151,373
Cash paid during the period for:
Interest	264	287	326
Income taxes, net of tax refunds	$ 7,938	$ 353	$ 3,191