Summary of Business and Significant Accounting Policies - Schedule of Certain Risks and Concentrations of Credit Risk (Detail)	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Oct. 31, 2013 Accounts receivable [Member] Customer 1 [Member]	Jan. 31, 2013 Accounts receivable [Member] Customer 1 [Member]	Oct. 31, 2013 Accounts receivable [Member] Customers 2 [Member]	Jan. 31, 2013 Accounts receivable [Member] Customers 2 [Member]	Oct. 31, 2013 Accounts receivable [Member] Customer 3 [Member]	Jan. 31, 2013 Accounts receivable [Member] Customer 3 [Member]	Oct. 31, 2013 Accounts receivable [Member] Customer 4 [Member]	Jan. 31, 2013 Accounts receivable [Member] Customer 4 [Member]	Oct. 31, 2013 Revenues [Member] Customer 1 [Member]	Oct. 31, 2012 Revenues [Member] Customer 1 [Member]	Oct. 31, 2013 Revenues [Member] Customer 1 [Member]	Oct. 31, 2012 Revenues [Member] Customer 1 [Member]	Oct. 31, 2013 Revenues [Member] Customers 2 [Member]	Oct. 31, 2012 Revenues [Member] Customers 2 [Member]	Oct. 31, 2013 Revenues [Member] Customers 2 [Member]	Oct. 31, 2012 Revenues [Member] Customers 2 [Member]	Oct. 31, 2013 Revenues [Member] Customer 3 [Member]	Oct. 31, 2012 Revenues [Member] Customer 3 [Member]	Oct. 31, 2013 Revenues [Member] Customer 3 [Member]	Oct. 31, 2012 Revenues [Member] Customer 3 [Member]	Oct. 31, 2013 Revenues [Member] Customer 4 [Member]	Oct. 31, 2012 Revenues [Member] Customer 4 [Member]	Oct. 31, 2013 Revenues [Member] Customer 4 [Member]	Oct. 31, 2012 Revenues [Member] Customer 4 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage		15.00%	11.00%	10.00%		10.00%	10.00%							11.00%		12.00%		12.00%	10.00%	11.00%