Earnings Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017	Sep. 05, 2012
Earnings Per Share [Abstract]
Net income as reported	$ 193,258	$ 148,563	$ 437,175	$ 343,617
Interest and costs attributable to 0.5% Exchangeable Senior Notes, net of income tax benefit		378		1,147
Numerator for diluted earnings per share	$ 193,258	$ 148,941	$ 437,175	$ 344,764
Basic weighted-average shares	151,257	163,478	153,290	163,186
Common stock equivalents	1,916	2,210	2,443	2,077
Shares attributable to 0.5% Exchangeable Senior Notes		5,874		5,864
Diluted weighted-average shares	153,173	171,562	155,733	171,127
Debt Instrument [Line Items]
Shares issued under stock incentive and employee stock purchase plans	19	788	899	2,762
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Weighted-average number of antidilutive options and restricted stock units	635	600	486	2,556
0.5% Exchangeable Senior Notes Due 2032 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					0.50%