Geographic Information Geographic Information Narrative (Details)			6 Months Ended	12 Months Ended	6 Months Ended
	Jul. 31, 2013 Customer concentration risk Revenues [Member] customer	Jul. 31, 2012 Customer concentration risk Revenues [Member] customer	Jul. 31, 2013 Customer concentration risk Accounts receivable customer	Jan. 31, 2013 Customer concentration risk Accounts receivable customer	Jul. 31, 2013 United Kingdom Geographic concentration Property and equipment country
Concentration Risk [Line Items]
Number of countries					1
Number of customers accounting for 10 percent or more of the concentration risk	0	0	1	1
Concentration risk, percentage			11.00%	31.00%	10.00%