Nature of Operations, Segment Reporting and Geographical Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jan. 31, 2015 Segment Customer	Jan. 31, 2014 Customer
Segment Reporting Information [Line Items]
Number of reporting segments	2
Customer accounted for greater than 10% of net sales	0	0
Goodwill assigned	$ 991	$ 991
T&M [Member]
Segment Reporting Information [Line Items]
Goodwill assigned	$ 1,000	$ 1,000