Property Plant and Equipment - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2012	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Property Plant And Equipment Useful Life And Values [Abstract]
Cash purchase of office building	$ 1,955,000
Depreciation expense		549,000	522,000	455,000
Costs of maintenance and repairs		$ 250,000	$ 325,000	$ 295,000