Earnings Per Share Information (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Earnings Per Share [Abstract]
Net income as reported	$ 129,324	$ 111,810	$ 241,374	$ 243,917
Basic weighted-average shares	146,622	152,731	146,687	154,306
Common stock equivalents	1,507	2,398	1,394	2,707
Diluted weighted-average shares	148,129	155,129	148,081	157,013
Debt Instrument [Line Items]
Shares issued under stock incentive and employee stock purchase plans	144	57	654	880
Restricted Stock Units RSU And Employee Stock Option Member [Member]
Debt Instrument [Line Items]
Weighted-average number of antidilutive options and restricted stock units	756	278	1,690	823

Shares issued under stock incentive and employee stock purchase plans.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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