Income Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2014	Sep. 05, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Parent	$ 114,378	$ 105,483	$ 89,054	$ 73,180	$ 147,163	$ 66,749	$ 67,930	$ 81,325	$ 382,095	$ 363,167	$ 340,032
Interest on Convertible Debt, Net of Tax									1,538	1,561	1,557
Net Income Available to Common Stockholders, Diluted									$ 383,633	$ 364,728	$ 341,589
Basic weighted-average shares	163,970	165,919	168,952	174,205	176,370	176,797	176,458	176,076	168,261	176,425	177,578
Common stock equivalents									1,854	2,420	2,439
Incremental Common Shares Attributable to Conversion of Debt Securities									5,858	5,858	5,858
Diluted weighted-average shares	171,683	173,405	176,414	182,391	184,736	185,133	184,838	184,107	175,973	184,703	185,875
Debt Instrument, Interest Rate, Stated Percentage												0.50%
Debt Instrument [Line Items]
Shares Issued under Stock Incentive and Employee Stock Purchase Plans									587	1,467	1,453
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									3,932	1,826	1,970
Senior Notes Due 2032 [Member]
Earnings Per Share [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	0.50%								0.50%			0.50%