Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Income Tax Disclosure [Abstract]
Federal corporate income tax rate	35.00%	35.00%	34.00%
Accrued income taxes included in accrued expenses	$ 303,000	$ 1,362,000
Net deferred tax (liabilities) assets	$ (114,000)	$ 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.