Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 31, 2018	$ 4,768,912	$ 1,779	$ 727,053	$ 5,161,551	$ (1,130,878)	$ 694	$ 8,713
Net income	112,050			112,050
Purchase of treasury stock	(25,143)				(25,143)
Exercise of stock options and stock based compensation issuances	(2,150)		(18,194)		16,044
Employee stock purchase plan issuances	315		(39)		354
Stock-based compensation	8,585		8,585
Dividends declared	(16,363)			(16,363)
Other comprehensive income	56					56
Capital contributions	32,914						32,914
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jan. 31, 2019	4,861,189	1,779	717,405	5,239,251	(1,139,623)	750	41,627
Cumulative effect adjustment upon adoption of new accounting pronouncements	(17,987)			(17,987)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Oct. 31, 2019	5,118,693	1,529	726,879	4,774,422	(425,183)	(5,831)	46,877
Net income	56,876			56,876
Purchase of treasury stock	(476,024)				(476,024)
Exercise of stock options and stock based compensation issuances	3,930		(17,112)		21,042
Employee stock purchase plan issuances	304		(41)		345
Stock-based compensation	13,383		13,383
Dividends declared	(15,012)			15,012
Other comprehensive income	278					278
Net Income (Loss) Attributable to Noncontrolling Interest	(1)						(1)
Capital contributions	2,653						2,653
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jan. 31, 2020	$ 4,705,080	$ 1,529	$ 723,109	$ 4,816,286	$ (879,820)	$ (5,553)	$ 49,529