Stockholders' Equity - Summary of Shares Purchased by Employees Under the Stock Purchase Plan (Detail) - $ / shares shares in Thousands |
6 Months Ended | |||
|---|---|---|---|---|
Aug. 31, 2016 |
Feb. 29, 2016 |
Aug. 31, 2015 |
Feb. 28, 2015 |
|
| Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] | ||||
| Shares Purchased | 25 | 28 | 25 | 25 |
| Purchase Price | $ 27.04 | $ 26.00 | $ 26.87 | $ 31.98 |