Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Income Tax Contingency [Line Items]
Effective tax rates	42.40%	36.90%
Increase in effective tax rate	5.50%
Unrecognized tax benefits	$ 0
Net deferred taxes assets	$ 400,000
Federal and California [Member]
Income Tax Contingency [Line Items]
Open tax years	2007
Other states [Member]
Income Tax Contingency [Line Items]
Open tax years	2009
Foreign Jurisdictions [Member]
Income Tax Contingency [Line Items]
Open tax years	2010