Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Apr. 30, 2014	Jan. 31, 2014
Property, Plant and Equipment [Abstract]
Land and building improvements	$ 0		$ 297,835
Computers, equipment and software	1,133,701		931,171
Furniture and fixtures	69,542		58,956
Leasehold improvements	362,170		296,390
Building in progress—leased facility	102,975		40,171
Property and equipment, gross	1,668,388		1,624,523
Less accumulated depreciation and amortization	(558,572)		(383,777)
Property and equipment, net	1,109,816		1,240,746
Land and building improvements held for sale (including perpetual parking rights)	$ 143,197	$ 137,653	$ 0