Acquisition - Additional Information (Detail) (Miltope's Ruggedized Printer Product Line Operation [Member], USD $)	12 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Miltope's Ruggedized Printer Product Line Operation [Member]
Business Acquisition [Line Items]
Completion date of acquisition	Jan. 22, 2014
Purchase price of the acquisition		$ 6,732,000
Amount held in escrow related to business acquisition		500,000
Duration of escrow deposits		12 months
General and administrative expenses		90,000
Goodwill	196,000
Amortization expense	$ 702,000