XML 93 R75.htm IDEA: XBRL DOCUMENT v3.23.3
Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Mortgage loans held for sale $ 2,519,900,000 $ 2,386,000,000  
Mortgage servicing rights 11,100,000 10,600,000  
Loans Receivable [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 2,600,000 (700,000)  
Purchases 0 0  
Sales and Settlements (14,800,000) (3,900,000)  
Principal Reductions 0 0  
Net transfers to (out of) Level 3 9,700,000 7,000,000  
Contractual Rights      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 200,000 (1,200,000)  
Purchases 52,400,000 35,300,000  
Sales and Settlements (52,100,000) (27,600,000)  
Principal Reductions 0 0  
Net transfers to (out of) Level 3 0 0  
Derivative Financial Instruments, Assets | Derivative Financial Instruments, Liabilities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings 104,200,000 (153,000,000.0)  
Purchases 0 0  
Sales and Settlements 0 0  
Principal Reductions 0 0  
Net transfers to (out of) Level 3 0 0  
Level 3 [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Mortgage loans held for sale 11,600,000 14,100,000 $ 11,700,000
Mortgage servicing rights 11,100,000 10,600,000 4,100,000
Level 3 [Member] | Fair Value, Recurring [Member] | Interest Rate Lock Commitments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net (31,600,000) $ (135,800,000) $ 17,200,000
Measurement Input, Prepayment Rate [Member] | Level 3 [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Servicing Asset at Fair Value, Amount 0.10    
Measurement Input, Discount Rate [Member] | Level 3 [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Servicing Asset at Fair Value, Amount 0.11    
Measurement Input, Default Rate [Member] | Level 3 [Member] | Fair Value, Recurring [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Servicing Asset at Fair Value, Amount $ 0.08