Discontinued Operations - Additional Information (Detail) (USD $)	0 Months Ended		3 Months Ended	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2013	May 03, 2014	Jan. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]
Proceeds from sale	$ 1,800,000	$ 18,600,000
Period of transition services and manufacturing, Maximum				12 months
Transition Service Agreement expiration date				Jan. 31, 2014
Amount received from disposition of inventory			$ 2,355,000	$ (2,355,000)