Income Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2013	Sep. 05, 2012
Earnings Per Share [Abstract]
Net Income Attributable to Parent	$ 147,163	$ 66,749	$ 67,930	$ 81,325	$ 131,524	$ 97,707	$ 65,222	$ 45,580	$ 363,167	$ 340,032	$ 170,606
Interest on Convertible Debt, Net of Tax									1,561	1,557	1,604
Net Income Available to Common Stockholders, Diluted									$ 364,728	$ 341,589	$ 172,210
Basic weighted-average shares	176,370	176,797	176,458	176,076	177,540	178,217	178,082	176,474	176,425	177,578	169,288
Common stock equivalents									2,420	2,439	2,817
Incremental Common Shares Attributable to Conversion of Debt Securities									5,858	5,858	5,858
Diluted weighted-average shares	184,736	185,133	184,838	184,107	185,669	186,501	186,442	184,888	184,703	185,875	177,963
Debt Instrument, Interest Rate, Stated Percentage												0.50%
Debt Instrument [Line Items]
Shares Issued under Stock Incentive and Employee Stock Purchase Plans									1,467	1,453	1,213
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									1,826	1,970	1,509
Senior Notes Due 2032 [Member]
Earnings Per Share [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	0.50%								0.50%			0.50%