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Fair Value Measurements Fair Value Measurements - Level 3 Rollforward (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Mortgage loans held for sale $ 2,027,300,000 $ 1,529,000,000  
Mortgage servicing rights 4,100,000 17,100,000  
Debt Securities [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) 0 0  
Purchases 0 0  
Sales and Settlements (3,900,000) 0  
Principal Reductions 0 0  
Net transfers to (out of) Level 3 0 0  
Loans Receivable [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) 300,000 200,000  
Purchases 0 0  
Sales and Settlements (3,300,000) (2,600,000)  
Principal Reductions 0 0  
Net transfers to (out of) Level 3 (400,000) 7,700,000  
Contractual Rights      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Net realized and unrealized gains (losses) (200,000) 1,900,000  
Purchases 24,700,000 15,200,000  
Sales and Settlements (37,500,000) 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]      
Debt securities collateralized by residential real estate 0 3,900,000 $ 3,900,000
Mortgage loans held for sale 11,700,000 15,100,000 9,800,000
Mortgage servicing rights 4,100,000 $ 17,100,000 $ 0
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 0.11    
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 $ 0.06