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Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Detail) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2014 | Jan. 31, 2013
--- | --- | ---
Assets And Liabilities Carrying Value And Fair Value [Line Items] |  |
Money market funds (included in cash and cash equivalents) | $ 4,734 | $ 8,784
State and municipal obligations (included in securities available for sale) | 18,766 | 8,509
Total | 23,500 | 17,293
Level 1 [Member] |  |
Assets And Liabilities Carrying Value And Fair Value [Line Items] |  |
Money market funds (included in cash and cash equivalents) | 4,734 | 8,784
State and municipal obligations (included in securities available for sale) |  | 8,509
Total | 4,734 | 17,293
Level 2 [Member] |  |
Assets And Liabilities Carrying Value And Fair Value [Line Items] |  |
Money market funds (included in cash and cash equivalents) |  |
State and municipal obligations (included in securities available for sale) | 18,766 |
Total | 18,766 |
Level 3 [Member] |  |
Assets And Liabilities Carrying Value And Fair Value [Line Items] |  |
Money market funds (included in cash and cash equivalents) |  |
State and municipal obligations (included in securities available for sale) |  |
Total |  |

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- Definition Money market funds at fair value. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value on a recurring basis by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References No definition available. + Details
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- Definition The fair value as of the balance sheet date of firm holdings in fixed income obligations issued by state and local governments and authorities. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=29643736&loc=d3e42546-110969 + Details
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