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Common Stock Repurchase Program (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2016 | May. 03, 2015 | Feb. 25, 2014
Stockholders Equity Note [Line Items] |  |  |
Cost of common stock repurchased | $ 2,397,000 | $ 745,000 |
Common Stock |  |  |
Stockholders Equity Note [Line Items] |  |  |
Common stock repurchased | 100,776 | 43,014 |
Cost of common stock repurchased | $ 5,000 | $ 2,000 |
Common Stock Repurchase Program February 25, 2014 [Member] | Common Stock |  |  |
Stockholders Equity Note [Line Items] |  |  |
Authorization amount for repurchase of common stock |  |  | $ 5,000,000
Common stock repurchased | 100,776 | 43,014 |
Cost of common stock repurchased | $ 2,397,000 | $ 745,000 |
Remaining authorized repurchase amount | $ 1,900,000 |  |

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