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Redeemable Preferred Stock - Dividends, Liquidations and Conversion Rights (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2022
Apr. 30, 2021
Series B Preferred Stock        
Class Of Stock [Line Items]        
Dividends, preferred stock, cash $ 0.8 $ 0.8 $ 1.6 $ 1.6