Segment Information, Significant Customers and Geographic Information - Schedule of Revenue by Major Customers by Reporting Segments (Detail) - Customer Concentration Risk [Member] - Total Revenue [Member]	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Customer A [Member]
Revenue, Major Customer [Line Items]
% of total revenues	32.00%	20.00%
Customer B [Member]
Revenue, Major Customer [Line Items]
% of total revenues		17.00%