Property and Equipment (Detail) - USD ($) $ in Thousands	Jan. 31, 2017	Jan. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 2,985,884	$ 2,635,665
Less accumulated depreciation and amortization	(1,198,350)	(919,837)
Property and equipment, net	1,787,534	1,715,828
Land
Property, Plant and Equipment [Line Items]
Property and equipment, gross	183,888	183,888
Buildings and building improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	621,377	614,081
Computers, equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	1,440,986	1,281,766
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	112,564	82,242
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 627,069	$ 473,688