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Income Taxes - Differences Between Consolidated Effective Income Tax Rate and Federal Statutory Rate (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2020
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2018
Reconciliation of Provision of Income Taxes [Line Items]        
Income taxes at statutory rate   $ (3,425) $ 13,408 $ 7,132
Discrete benefit resulting from CARES Act   (39,086) 0 0
Discrete benefit resulting from TCJA $ (37,500) 0 0 (37,505)
State income taxes   1,188 1,189 1,014
Expiration of state income tax credits   4,858 4,121 4,117
Excess tax benefits   (1,284) (1,388) (1,638)
Nondeductible expenses   2,303 1,786 1,890
Change in valuation allowance   (3,185) (5,380) (5,297)
Other   (124) (570) 677
Income tax expense (benefit)   (44,585) 10,553 (30,874)
State        
Reconciliation of Provision of Income Taxes [Line Items]        
Income tax credits   (3,926) (2,139) (804)
Federal        
Reconciliation of Provision of Income Taxes [Line Items]        
Income tax credits   $ (1,904) $ (474) $ (460)