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Financial Instruments and Fair Value Disclosures - (Mortgage Servicing Rights Unobservable Inputs) (Details) - Financial Services - Level 3
May 31, 2020
Mortgage prepayment rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable inputs for valuation of mortgage servicing rights 0.20
Discount rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable inputs for valuation of mortgage servicing rights 0.11
Delinquency rate  
Fair Value Measurement Inputs and Valuation Techniques [Line Items]  
Unobservable inputs for valuation of mortgage servicing rights 0.04