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Financing Arrangements - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2014 | Jan. 31, 2013
Debt Disclosure [Abstract] |  |
Maximum borrowing amount of revolving loan | $ 4,250,000 |
Interest rate on borrowings under the line of credit | LIBOR plus 2.25% |
Interest rate | 2.25% |
Available funds designated to cover letters of credit issued by Bank in support of project development activities | 1,350,000 |
Maximum amount of standby letters of credits that may be outstanding | 10,000,000 |
Borrowings outstanding under bank financing arrangements | $ 0 | $ 0
Expiration date of financing arrangements | May 31, 2015 |
Ratio of total funded debt to EBITDA | 2 | 2
Fixed charge coverage ratio | 1.25 | 1.25
Ratio of senior funded debt to EBITDA | 1.50 | 1.50

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