Stock Option Plan and Stock Based Compensation - Summary of Assumptions Used and Weighted Average Grant-Date Fair Value of Stock Options Granted (Detail) - $ / shares |
3 Months Ended | |
|---|---|---|
May 31, 2016 |
May 31, 2015 |
|
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | ||
| Expected volatility | 24.06% | |
| Expected term (years) | 3 years | |
| Risk free interest rate | 0.89% | |
| Dividend yield | 4.92% | |
| Weighted average grant-date fair value | $ 0 | $ 2.24 |