Consolidated Statements of Changes in Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Parent [Member]	Noncontrolling Interest [Member]
Shares, Issued at Oct. 31, 2014		177,930
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 31, 2014	$ 3,860,697	$ 1,779	$ 712,162	$ 3,232,035	$ (88,762)	$ (2,838)	$ 3,854,376	$ 6,321
Net income	$ 363,167			363,167			363,167
Purchase of treasury stock, shares	(1,665)
Purchase of treasury stock, value	$ (56,888)				(56,888)		(56,888)
Exercise of stock options and stock-based compensation issuances, shares		1
Exercise of stock options and stock-based compensation issuances, value	37,826		(6,956)		44,782		37,826
Employee stock purchase issuances, shares
Employee stock purchase issuances, value	844		16		828		844
Stock-based compensation	22,903		22,903				22,903
Other Comprehensive Income (Loss)	329					329	329
Income (loss) attributable to noncontrolling interest	(14)						0	(14)
Capital contribution (distribution)	(785)						0	(785)
Shares, Issued at Oct. 31, 2015		177,931
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 31, 2015	4,228,079	$ 1,779	728,125	3,595,202	(100,040)	(2,509)	4,222,557	5,522
Net income	$ 382,095			382,095			382,095
Purchase of treasury stock, shares	(13,652)
Purchase of treasury stock, value	$ (392,772)				(392,772)		(392,772)
Exercise of stock options and stock-based compensation issuances, shares		6
Exercise of stock options and stock-based compensation issuances, value	(9,524)		(26,294)		16,770		(9,524)
Employee stock purchase issuances, shares
Employee stock purchase issuances, value	1,084		(46)		1,130		1,084
Stock-based compensation	26,679		26,679				26,679
Other Comprehensive Income (Loss)	(827)					(827)	(827)
Income (loss) attributable to noncontrolling interest	(16)						0	(16)
Capital contribution (distribution)	404						0	404
Shares, Issued at Oct. 31, 2016		177,937
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 31, 2016	4,235,202	$ 1,779	728,464	3,977,297	(474,912)	(3,336)	4,229,292	5,910
Net income	$ 535,495			535,495			535,495
Purchase of treasury stock, shares	(7,694)
Purchase of treasury stock, value	$ (290,881)				(290,881)		(290,881)
Exercise of stock options and stock-based compensation issuances, shares
Exercise of stock options and stock-based compensation issuances, value	64,903		(36,896)		101,799		64,903
Employee stock purchase issuances, shares
Employee stock purchase issuances, value	1,221		81		1,140		1,221
Stock-based compensation	28,466		28,466				28,466
Dividends	(38,728)			(38,728)			(38,728)
Other Comprehensive Income (Loss)	1,426					1,426	1,426
Income (loss) attributable to noncontrolling interest	(14)						0	(14)
Capital contribution (distribution)
Shares, Issued at Oct. 31, 2017		177,937
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 31, 2017	$ 4,537,090	$ 1,779	$ 720,115	$ 4,474,064	$ (662,854)	$ (1,910)	$ 4,531,194	$ 5,896