Business Combinations (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 31, 2015	Oct. 31, 2014	[1]
Business Acquisition [Line Items]
Goodwill	$ 2,335,816	$ 2,255,708
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	120,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	8,400
Goodwill	92,200
Business Acquisition, Goodwill, Expected Tax Deductible Amount	2,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	37,100
Business Combination, Acquisition Related Costs	$ 4,400
Series of Individually Immaterial Business Acquisitions | Minimum
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	1 year
Series of Individually Immaterial Business Acquisitions | Maximum
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years

[1] Derived from audited financial statements.