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Contingencies - Narrative (Details)
$ in Millions
Sep. 30, 2023
USD ($)
case
loan
Sep. 30, 2022
USD ($)
loan
Loss Contingency [Abstract]    
Accrued penalty $ 9.8  
Number of cases | case 5  
Warranty repurchase demands unpaid principal balance $ 47.7 $ 53.3
Warranty repurchase demands number of loans | loan 176 280