Summary of Business and Significant Accounting Policies - Schedule of Property and Equipment Estimated Useful Lives (Detail)	9 Months Ended
	Oct. 31, 2014
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	5 years
Minimum | Computer, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Minimum | Capitalized internal-use software development costs
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	3 years
Maximum | Computer, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	9 years
Maximum | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	10 years
Maximum | Capitalized internal-use software development costs
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful lives	5 years