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Segment Disclosure - Revenues Related to Operations by Geographic Areas (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 633,719	$ 615,204	$ 605,005	$ 568,604	$ 587,159	$ 555,805	$ 557,204	$ 542,043	$ 2,422,532	$ 2,242,211	$ 2,057,472
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									1,205,880	1,143,816	1,020,654
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									287,381	300,352	272,911
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									239,964	218,794	238,588
Asia-Pacific And Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue									$ 689,307	$ 579,249	$ 525,319

X

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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+ References

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