Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2016	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2013
Income Tax Examination [Line Items]
Valuation allowance	$ (73,399)	$ (74,357)
Increase in valuation allowance	1,000
Excess tax benefits from equity compensation plans	3,788	8,947	$ 1,513
Federal net operating loss carryforwards	21,800
State net operating loss carryforwards	$ 10,700
Federal operating losses expiration, beginning period	2019
Federal operating losses expiration, ending period	2035
State operating losses expiration, beginning period	2017
State operating losses expiration, ending period	2035
Foreign net operating loss carryforwards	$ 14,600
Operating losses can be carried forward indefinitely	$ 13,900
Remaining foreign net operating losses expiration period	2017
Stock-based compensation	$ 6,983	3,344
Research and development credit carryforwards	$ 6,484	4,935
Federal research and development credit expiration beginning period	2029
Other state research and development credit expiration beginning period	2021
Undistributed earnings of its foreign subsidiaries	$ 10,400
Total unrecognized tax benefits	6,388	5,322	4,980	$ 3,971
Unrecognized tax benefits that, if recognized, would affect our effective tax rate	2,600	4,300	4,000
Interest and penalties recorded in the consolidated statements of operations		100	200
Accrued interest and penalties recorded on the consolidated balance sheets	800	800
Federal
Income Tax Examination [Line Items]
Research and development credit carryforwards	2,400
California
Income Tax Examination [Line Items]
Research and development credit carryforwards	5,500
Enterprise zone tax credit carryforwards	$ 300
Tax credit expiration beginning period	2024
Other state
Income Tax Examination [Line Items]
Stock-based compensation	$ 3,800
Research and development credit carryforwards	200
Additional Paid-In Capital
Income Tax Examination [Line Items]
Excess tax benefits from equity compensation plans	$ 3,788	$ 8,947	$ 1,513