Estimated Useful Life of Property and Equipment (Detail)	12 Months Ended
	Jan. 31, 2015
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated useful life	5 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated useful life	10 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated useful life	5 years
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated useful life	10 years
Leasehold Improvements
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated useful life	Lesser of useful lives or related lease term
Hardware And Software | Minimum
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated useful life	3 years
Hardware And Software | Maximum
Property, Plant and Equipment [Line Items]
Property and Equipment, Estimated useful life	7 years