Balance Sheet Information - Marketable Securities (Detail) - USD ($)
$ in Thousands |
3 Months Ended |
|
May 31, 2016 |
Feb. 29, 2016 |
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
$ 39,010
|
$ 36,014
|
| Marketable securities, Gross Unrealized Gains |
773
|
432
|
| Marketable securities, Gross Unrealized Losses |
(56)
|
(52)
|
| Marketable securities, Fair Value |
39,727
|
36,394
|
| Asset-backed securities |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
4,849
|
4,717
|
| Marketable securities, Gross Unrealized Gains |
19
|
9
|
| Marketable securities, Gross Unrealized Losses |
|
(3)
|
| Marketable securities, Fair Value |
4,868
|
4,723
|
| Corporate debt securities |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
20,910
|
19,135
|
| Marketable securities, Gross Unrealized Gains |
26
|
11
|
| Marketable securities, Gross Unrealized Losses |
(20)
|
(22)
|
| Marketable securities, Fair Value |
20,916
|
19,124
|
| Equity securities |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
1,596
|
3,095
|
| Marketable securities, Gross Unrealized Gains |
709
|
380
|
| Marketable securities, Fair Value |
2,305
|
3,475
|
| Available-for-sale securities, gross realized gains |
400
|
|
| Foreign government bonds |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
201
|
205
|
| Marketable securities, Fair Value |
201
|
205
|
| Mortgage-backed securities |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
1,812
|
2,341
|
| Marketable securities, Gross Unrealized Gains |
1
|
|
| Marketable securities, Gross Unrealized Losses |
(5)
|
(13)
|
| Marketable securities, Fair Value |
1,808
|
2,328
|
| U.S. government agency securities |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
6,189
|
2,242
|
| Marketable securities, Gross Unrealized Gains |
6
|
6
|
| Marketable securities, Gross Unrealized Losses |
(29)
|
(14)
|
| Marketable securities, Fair Value |
6,166
|
2,234
|
| U.S. government notes |
|
|
| Schedule of Available-for-sale Securities [Line Items] |
|
|
| Marketable securities, Amortized Cost |
3,453
|
4,279
|
| Marketable securities, Gross Unrealized Gains |
12
|
26
|
| Marketable securities, Gross Unrealized Losses |
(2)
|
|
| Marketable securities, Fair Value |
$ 3,463
|
$ 4,305
|