Summary of Business and Significant Accounting Policies - Additional Information 1 (Detail)	3 Months Ended
	Apr. 30, 2014
Minimum [Member]
Concentration Risk [Line Items]
Customer payment terms	30 days
Minimum [Member] | Accounts receivable [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Minimum [Member] | Revenues [Member]
Concentration Risk [Line Items]
Concentration risk percentage	10.00%
Maximum [Member]
Concentration Risk [Line Items]
Customer payment terms	60 days