Income Taxes - Additional Information (Detail) (USD $)	9 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Jan. 31, 2013
Schedule Of Income Taxes [Line Items]
Federal corporate income tax rate	35.00%	35.00%
Accrued income taxes included in accrued expenses	$ 741,000		$ 1,362,000
Net deferred tax assets	105,000		1,639,000
Federal state and local income tax examination applicability description	No longer subject to federal, state and local income tax examinations by tax authorities for its fiscal years ended on or before January 31, 2010.
Internal Revenue Service (IRS) [Member]
Schedule Of Income Taxes [Line Items]
Federal income tax return to provision adjustments	$ 199,000	$ 116,000