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Employee Benefit Plans - Additional Information (Detail) (USD $) | 12 Months Ended
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Jan. 31, 2015 | Jan. 31, 2014
Postemployment Benefits [Abstract] |  |
Compensation expense | $ 100,000 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense | $ 100,000 us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Contributions paid or accrued amounted | $ 294,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | $ 251,000 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount

X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
Name: | us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of plan compensation cost recognized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6418621&loc=d3e17540-113929 + Details
Name: | us-gaap_EmployeeStockOwnershipPlanESOPCompensationExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_PostemploymentBenefitsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration