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Income Taxes - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012
Income Tax Disclosure [Abstract] |  |  |
Federal corporate income tax rate | 35.00% | 35.00% | 34.00%
Accrued income taxes included in accrued expenses | $ 303,000 | $ 1,362,000 |
Net deferred tax (liabilities) assets | $ (114,000) | $ 1,639,000 |
Federal state and local income tax examination applicability description | No longer subject to federal, state and local income tax examinations by tax authorities for its fiscal years ended on or before January 31, 2010. |  |

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