Segment Disclosure - Revenues Related to Operations by Geographic Areas (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 539,012	$ 521,812	$ 517,697	$ 478,951	$ 504,875	$ 482,945	$ 499,257	$ 475,137	$ 2,057,472	$ 1,962,214	$ 1,756,017
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,020,654	939,749	834,191
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									272,911	273,041	225,797
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									238,588	264,141	289,420
Asia-Pacific And Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 525,319	$ 485,283	$ 406,609