Summary of Significant Accounting Policies - Components of Property and Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014		Oct. 31, 2013
Property, Plant and Equipment, Net [Abstract]
Computer and other equipment	$ 419,951		$ 372,295
Buildings	68,871		69,352
Furniture and fixtures	41,089		31,317
Land	20,414		20,414
Leasehold improvements	136,513		96,334
Property, Plant and Equipment, Gross, Total	686,838		589,712
Less accumulated depreciation and amortization(1)	(437,740)	[1]	(392,112)	[1]
Total	$ 249,098		$ 197,600

[1] Accumulated depreciation and amortization includes write-offs due to retirement of fully amortized fixed assets.