Profit-Sharing Plan - Additional Information (Detail) (USD $)	12 Months Ended
Jan. 31, 2014	Jan. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Contributions paid or accrued amounted	$ 251,000	$ 261,000

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

No definition available.

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