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Shareholders' Equity - Additional Information (Detail) |  | 9 Months Ended | 109 Months Ended
--- | --- | --- | ---
Nov. 30, 2017 USD ($) | Nov. 30, 2017 USD ($) $ / shares shares | Nov. 30, 2017 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Repurchase of common stock through a stock repurchase program | $ | $ 40,000,000 | $ 40,000,000 | $ 40,000,000
Repurchase of common stock | shares |  | 191,033 | 1,442,236
Repurchase of common stock, average cost per share | $ / shares |  | $ 17.33 | $ 14.99
Total amount available to repurchase of shares | $ | $ 18,400,000 |  |
Unrelated to Stock Repurchase Program [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Repurchase of common stock | shares |  | 145 |

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