Geographic Information Narrative (Details) - customer	3 Months Ended		12 Months Ended
	Apr. 30, 2016	Apr. 30, 2015	Jan. 31, 2016
Customer concentration risk | Accounts receivable
Concentration Risk [Line Items]
Number of customers accounting for 10 percent or more of the concentration risk	2		2
Customer concentration risk | Revenues
Concentration Risk [Line Items]
Number of customers accounting for 10 percent or more of the concentration risk	2	1
Geographic concentration | Property and equipment | United States
Concentration Risk [Line Items]
Concentration risk, percentage	10.00%		10.00%
Customer One | Customer concentration risk | Accounts receivable
Concentration Risk [Line Items]
Concentration risk, percentage	21.00%		26.00%
Customer One | Customer concentration risk | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%
Customer Two | Customer concentration risk | Accounts receivable
Concentration Risk [Line Items]
Concentration risk, percentage	18.00%		16.00%
Customer Two | Customer concentration risk | Revenues
Concentration Risk [Line Items]
Concentration risk, percentage	14.00%	11.00%