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Contingent Liabilities and Commitments - Repurchase Commitments Narrative (Details) - USD ($)
$ in Millions
6 Months Ended
Feb. 29, 2020
Aug. 31, 2019
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Repurchase agreement term 24 months  
Accrued loss on repurchases $ 1.3 $ 0.9
Obligation to Repurchase from Dealers    
Purchase Commitment, Excluding Long-term Commitment [Line Items]    
Contingent liability on repurchase agreements $ 1,400.0 $ 874.9