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Earnings Per Share Information (Details) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Earnings Per Share [Abstract]        
Net income as reported $ 75,670 $ 129,324 $ 132,546 $ 241,374
Basic weighted-average shares 128,205 146,622 133,175 146,687
Common stock equivalents 604 1,507 1,174 1,394
Diluted weighted-average shares 128,809 148,129 134,349 148,081
Debt Instrument [Line Items]        
Shares issued under stock incentive and employee stock purchase plans 60 144 608 654
Restricted Stock Units RSU And Employee Stock Option Member [Member]        
Debt Instrument [Line Items]        
Weighted-average number of antidilutive options and restricted stock units 3,967 756 2,321 1,690