Financial Assets and Liabilities - Summary of Cash Cash Equivalents and Investments (Detail) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014		Oct. 31, 2013
Cash, Cash Equivalents and Investments [Line Items]
Cost	$ 996,631		$ 1,033,977
Gross Unrealized Gains	0		0
Gross Unrealized Losses Less Than 12 Months	0		0
Gross Unrealized Losses 12 Months or Longer	0		0
Estimated Fair Value	996,631	[1]	1,033,977	[1]
Non Interest Bearing Cash
Cash, Cash Equivalents and Investments [Line Items]
Cost	192,792		183,292
Gross Unrealized Gains	0		0
Gross Unrealized Losses Less Than 12 Months	0		0
Gross Unrealized Losses 12 Months or Longer	0		0
Estimated Fair Value	192,792	[1]	183,292	[1]
Cash Deposits and Money Market Funds
Cash, Cash Equivalents and Investments [Line Items]
Cost	792,970		839,149
Gross Unrealized Gains	0		0
Gross Unrealized Losses Less Than 12 Months	0		0
Gross Unrealized Losses 12 Months or Longer	0		0
Estimated Fair Value	792,970	[1]	839,149	[1]
Classified As Current Assets, Total
Cash, Cash Equivalents and Investments [Line Items]
Cost	985,762		1,022,441
Gross Unrealized Gains	0		0
Gross Unrealized Losses Less Than 12 Months	0		0
Gross Unrealized Losses 12 Months or Longer	0		0
Estimated Fair Value	985,762	[1]	1,022,441	[1]
Non Marketable Equity Securities
Cash, Cash Equivalents and Investments [Line Items]
Cost	10,869		11,536
Gross Unrealized Gains	0		0
Gross Unrealized Losses Less Than 12 Months	0		0
Gross Unrealized Losses 12 Months or Longer	0		0
Estimated Fair Value	$ 10,869	[1]	$ 11,536	[1]

[1] See Note 6. Fair Value Measures for further discussion on fair values of money market funds and non-marketable equity securities.