Earnings Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016	Sep. 05, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Parent	$ 310,976	$ 193,258	$ 111,810	$ 132,107	$ 191,878	$ 148,563	$ 124,638	$ 70,416	$ 748,151	$ 535,495	$ 382,095
Interest on Convertible Debt, Net of Tax										1,434	1,538
Net Income Available to Common Stockholders, Diluted									$ 748,151	$ 536,929	$ 383,633
Basic weighted-average shares	148,066	151,257	152,731	155,882	159,232	163,478	163,492	162,588	151,984	162,222	168,261
Common stock equivalents									2,217	2,147	1,854
Incremental Common Shares Attributable to Conversion of Debt Securities										5,118	5,858
Diluted weighted-average shares	149,603	153,173	155,129	158,897	164,565	171,562	171,403	170,417	154,201	169,487	175,973
Debt Instrument [Line Items]
Shares Issued under Stock Incentive and Employee Stock Purchase Plans									1,066	3,116	587
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									813	1,966	3,932
Senior Notes Due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage												0.50%