Summary of Significant Accounting Policies - Property and Equipment Estimated Useful Lives (Detail)	12 Months Ended
	Jan. 31, 2015
Building
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	40 years
Leasehold improvements
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Software
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software Development
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Maximum | Furniture, Fixtures and Equipment
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	10 years
Minimum | Furniture, Fixtures and Equipment
Significant Accounting Policies [Line Items]
Property, Plant and Equipment, Useful Life	2 years