Earnings Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2015	Sep. 05, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Parent	$ 191,878	$ 148,563	$ 124,638	$ 70,416	$ 114,378	$ 105,483	$ 89,054	$ 73,180	$ 535,495	$ 382,095	$ 363,167
Interest on Convertible Debt, Net of Tax									1,434	1,538	1,561
Net Income Available to Common Stockholders, Diluted									$ 536,929	$ 383,633	$ 364,728
Basic weighted-average shares	159,232	163,478	163,492	162,588	163,970	165,919	168,952	174,205	162,222	168,261	176,425
Common stock equivalents									2,147	1,854	2,420
Incremental Common Shares Attributable to Conversion of Debt Securities									5,118	5,858	5,858
Diluted weighted-average shares	164,565	171,562	171,403	170,417	171,683	173,405	176,414	182,391	169,487	175,973	184,703
Debt Instrument [Line Items]
Shares Issued under Stock Incentive and Employee Stock Purchase Plans									3,116	587	1,467
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									1,966	3,932	1,826
Senior Notes Due 2032 [Member]
Earnings Per Share [Abstract]
Debt Instrument, Interest Rate, Stated Percentage												0.50%