Earnings Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017	Sep. 05, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Parent	$ 202,315	$ 146,318	$ 129,324	$ 112,050	$ 310,976	$ 193,258	$ 111,810	$ 132,107	$ 590,007	$ 748,151	$ 535,495
Interest on Convertible Debt, Net of Tax											1,434
Net Income Available to Common Stockholders, Diluted									$ 590,007	$ 748,151	$ 536,929
Basic weighted-average shares	141,909	144,750	146,622	146,751	148,066	151,257	152,731	155,882	145,008	151,984	162,222
Common stock equivalents									1,493	2,217	2,147
Incremental Common Shares Attributable to Conversion of Debt Securities											5,118
Diluted weighted-average shares	143,567	146,275	148,129	148,032	149,603	153,173	155,129	158,897	146,501	154,201	169,487
Debt Instrument [Line Items]
Shares Issued under Stock Incentive and Employee Stock Purchase Plans									1,394	1,066	3,116
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									1,156	813	1,966
Senior Notes Due 2032 [Member]
Earnings Per Share [Abstract]
Debt Instrument, Interest Rate, Stated Percentage												0.50%