Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands		6 Months Ended
		Apr. 30, 2016		Oct. 31, 2015
Other assets:
Deferred Compensation Investments		$ 25,230		$ 24,124
Foreign Currency Contract, Asset, Fair Value Disclosure	[1]	5,671
Total assets measured at fair value		3,731,362		2,976,634
Foreign Currency Contracts, Liability, Fair Value Disclosure				3,083
Business Combination, Contingent Consideration, Liability		4,275
Liabilities, Fair Value Disclosure, Recurring				2,843
Interest Rate Derivative Assets, at Fair Value				32,737
Liabilities
Total liabilities measured at fair value		4,275		38,663
Level 1 [Member]
Other assets:
Deferred Compensation Investments		25,230		24,124
Total assets measured at fair value		267,522		222,977
Liabilities
Total liabilities measured at fair value		0		0
Level 2 [Member]
Other assets:
Deferred Compensation Investments				0
Foreign Currency Contract, Asset, Fair Value Disclosure	[1]	5,671
Total assets measured at fair value		3,463,840		2,753,657
Foreign Currency Contracts, Liability, Fair Value Disclosure				3,083
Interest Rate Derivative Assets, at Fair Value				32,737
Liabilities
Total liabilities measured at fair value		0		35,820
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Business Combination, Contingent Consideration, Effect on Foreign Currency		(22)
Other assets:
Business Combination, Contingent Consideration, Liability		4,275		2,843
Liabilities
Total liabilities measured at fair value		4,275		2,843
Institutional Money Market Funds [Member]
Available-for-sale:
Cash and cash equivalents, fair value disclosure		242,292		198,853
Institutional Money Market Funds [Member] | Level 1 [Member]
Available-for-sale:
Cash and cash equivalents, fair value disclosure		242,292		198,853
Corporate Obligations [Member]
Available-for-sale:
Cash and cash equivalents, fair value disclosure		823,750	[2]	609,082	[3]
Corporate Obligations [Member] | Level 2 [Member]
Available-for-sale:
Cash and cash equivalents, fair value disclosure		823,750	[2]	609,082	[3]
One year or less to maturity [Member] | Floating Rate Notes [Member] | Short-term Investments [Member]
Available-for-sale:
Investments		397,282	[2]	145,553	[3]
One year or less to maturity [Member] | Floating Rate Notes [Member] | Level 2 [Member] | Short-term Investments [Member]
Available-for-sale:
Investments		397,282	[2]	145,553	[3]
One year or less to maturity [Member] | Corporate Obligations [Member] | Short-term Investments [Member]
Available-for-sale:
Investments		2,137,183	[2]	1,899,374	[3]
One year or less to maturity [Member] | Corporate Obligations [Member] | Level 2 [Member] | Short-term Investments [Member]
Available-for-sale:
Investments		2,137,183	[2]	1,899,374	[3]
One year or less to maturity [Member] | Floating Rate Notes Issued At Par [Member] | Short-term Investments [Member]
Available-for-sale:
Investments		99,954		99,648
One year or less to maturity [Member] | Floating Rate Notes Issued At Par [Member] | Level 2 [Member] | Short-term Investments [Member]
Available-for-sale:
Investments		$ 99,954		$ 99,648

[1] The Company has a master netting arrangement by counterparty with respect to derivative contracts.

[2] The amortized cost of the Company’s investments classified as available-for-sale as of April 30, 2016 was $3.3 billion.

[3] The amortized cost of the Company’s investments classified as available-for-sale as of October 31, 2015 was $2.6 billion.