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

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration