Segment Reporting - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Schedule Of Sales Revenue By Business Segment [Line Items]
Revenues	$ 11,442,000	$ 15,681,000	$ 7,554,000	$ 17,142,000	$ 14,963,000	$ 22,906,000	$ 19,545,000	$ 25,732,000	$ 51,819,000	$ 83,146,000	$ 92,108,000
Reduction in capital expenditures and fixed assets									6,000	192,000	32,000
Intersegment Sales Elimination [Member]
Schedule Of Sales Revenue By Business Segment [Line Items]
Revenues									$ 196,000	$ 562,000	$ 334,000