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Subsequent events - Narrative (Details)
$ in Millions
3 Months Ended
May 25, 2017
USD ($)
employee
Jul. 29, 2017
USD ($)
Sterling Jewelers, Inc. | Subsequent Event    
Subsequent Event [Line Items]    
Servicing agreement, term 5 years  
Servicing agreement, renewal term 2 years  
Consumer Portfolio Segment | Sterling Jewelers, Inc. | Subsequent Event    
Subsequent Event [Line Items]    
Loans receivables held for sale, amount $ 1,000  
OHIO | Subsequent Event    
Subsequent Event [Line Items]    
Expected number of positions eliminated | employee 250  
Forecast | Securitization Facility    
Subsequent Event [Line Items]    
Repayments of secured debt   $ 600