Balance Sheet Information and Fair Value - Summary of Securities with Gross Unrealized Loss Positions and Fair Values (Detail) - USD ($) $ in Thousands	Feb. 29, 2016	Feb. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	$ 16,509	$ 20,963
Less Than 12 Months, Unrealized Losses	(43)	(83)
12 Months or Greater, Fair Value	1,007	0
12 Months or Greater, Unrealized Losses	(9)	0
Total, Fair Value	17,516	20,963
Total, Unrealized Losses	(52)	(83)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	1,788	2,385
Less Than 12 Months, Unrealized Losses	(3)	(4)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	1,788	2,385
Total, Unrealized Losses	(3)	(4)
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	12,088	11,346
Less Than 12 Months, Unrealized Losses	(22)	(13)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	12,088	11,346
Total, Unrealized Losses	(22)	(13)
Mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	1,746	1,923
Less Than 12 Months, Unrealized Losses	(8)	(10)
12 Months or Greater, Fair Value	385	0
12 Months or Greater, Unrealized Losses	(5)	0
Total, Fair Value	2,131	1,923
Total, Unrealized Losses	(13)	(10)
U.S. government agency securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value	887	4,331
Less Than 12 Months, Unrealized Losses	(10)	(24)
12 Months or Greater, Fair Value	622	0
12 Months or Greater, Unrealized Losses	(4)	0
Total, Fair Value	1,509	4,331
Total, Unrealized Losses	$ (14)	(24)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Less Than 12 Months, Fair Value		978
Less Than 12 Months, Unrealized Losses		(32)
12 Months or Greater, Fair Value		0
12 Months or Greater, Unrealized Losses		0
Total, Fair Value		978
Total, Unrealized Losses		$ (32)