Summary of Business and Significant Accounting Policies - Schedule of Certain Risks and Concentrations of Credit Risk (Detail)	12 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jan. 31, 2014 Accounts receivable [Member] Customer 1 [Member]	Jul. 31, 2014 Accounts receivable [Member] Customer 2 [Member]	Jul. 31, 2014 Accounts receivable [Member] Customer 3 [Member]	Jul. 31, 2013 Revenues [Member] Customer 1 [Member]	Jul. 31, 2013 Revenues [Member] Customer 1 [Member]	Jul. 31, 2014 Revenues [Member] Customer 2 [Member]	Jul. 31, 2013 Revenues [Member] Customer 2 [Member]	Jul. 31, 2014 Revenues [Member] Customer 2 [Member]	Jul. 31, 2013 Revenues [Member] Customer 2 [Member]	Jul. 31, 2014 Revenues [Member] Customer 3 [Member]	Jul. 31, 2013 Revenues [Member] Customer 3 [Member]	Jul. 31, 2014 Revenues [Member] Customer 3 [Member]	Jul. 31, 2013 Revenues [Member] Customer 3 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage	10.00%	18.00%	14.00%	11.00%	11.00%