Stock Option Plan and Stock Based Compensation - Summary of Stock Options Exercised and Tax Benefits Realized from Stock Based Compensation (Detail) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
May 31, 2016 |
May 31, 2015 |
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||
| Total cash received | $ 2,910 | |
| Income tax benefits | 0 | $ 0 |
| Total grant-date fair value | 532 | |
| Intrinsic value | $ 969 | |