Earnings Per Share Information (Details) - USD ($) shares in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 15, 2017	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Oct. 31, 2016	Sep. 05, 2012
Earnings Per Share [Abstract]
Net income as reported		$ 148,563,000	$ 105,483,000	$ 343,617,000	$ 267,717,000	$ 382,095,000
Interest and costs attributable to 0.5% Exchangeable Senior Notes, net of income tax benefit		378,000	388,000	1,147,000	1,165,000
Numerator for diluted earnings per share		$ 148,941,000	$ 105,871,000	$ 344,764,000	$ 268,882,000
Basic weighted-average shares		163,478	165,919	163,186	169,692
Common stock equivalents		2,210	1,628	2,077	1,853
Shares attributable to 0.5% Exchangeable Senior Notes		5,874	5,858	5,864	5,858
Diluted weighted-average shares		171,562	173,405	171,127	177,403
Debt Instrument [Line Items]
Shares issued under stock incentive and employee stock purchase plans		788	19	2,762	502
0.5% Exchangeable Senior Notes Due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							0.50%
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Weighted-average number of antidilutive options and restricted stock units		600	4,243	2,556	3,854
Subsequent Event [Member] | 0.5% Exchangeable Senior Notes Due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	0.50%
Debt Instrument, Repurchase Amount	$ 287,500,000.000
Debt Instrument, Repurchase Date	Sep. 15, 2017