Summary of Business and Significant Accounting Policies - Schedule of Certain Risks and Concentrations of Credit Risk (Detail)	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Revenues [Member] | Customer 1 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage
Revenues [Member] | Customer 2 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage		12.00%	12.00%
Revenues [Member] | Customer 3 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage		11.00%
Revenues [Member] | Customer 4 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage			16.00%
Accounts receivable [Member] | Customer 1 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage		15.00%
Accounts receivable [Member] | Customer 2 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage		10.00%
Accounts receivable [Member] | Customer 3 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage	10.00%	10.00%
Accounts receivable [Member] | Customer 4 [Member]
Concentration Risk [Line Items]
Concentrations of credit risk, percentage