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Debt and Capital Lease Obligations - Asset Backed Notes (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jul. 31, 2017
Jan. 31, 2017
Jan. 31, 2016
May 15, 2017
Apr. 30, 2017
Debt Instrument [Line Items]          
Monthly fee percentage on outstanding balance 4.75%        
Amount of notes issued $ 1,114,650        
Proceeds from Securitizations of Consumer Loans 1,085,246        
Debt issuance costs 6,827 $ 10,853      
2016-A Class B Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued 70,510        
Proceeds from Securitizations of Consumer Loans $ 68,309        
Fixed annual rate 8.96%        
Effective interest rate 9.88%        
2016-A Class C Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued $ 70,510        
Proceeds from Securitizations of Consumer Loans $ 71,648        
Fixed annual rate 12.00%        
Effective interest rate 10.96%        
2016-B Class A Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued $ 391,840        
Proceeds from Securitizations of Consumer Loans $ 380,033        
Fixed annual rate 3.73%        
Effective interest rate 5.56%        
2016-B Class B Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued $ 111,960        
Proceeds from Securitizations of Consumer Loans $ 108,586        
Fixed annual rate 7.34%        
Effective interest rate 8.09%        
2017-A Class A Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued $ 313,220        
Proceeds from Securitizations of Consumer Loans $ 304,451        
Fixed annual rate 2.73%        
Effective interest rate 4.97%        
2017-A Class B Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued $ 106,270        
Proceeds from Securitizations of Consumer Loans $ 103,300        
Fixed annual rate 5.11%        
Effective interest rate 5.80%        
2017-A Class C Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued $ 50,340        
Proceeds from Securitizations of Consumer Loans $ 48,919        
Fixed annual rate 7.40%        
Effective interest rate 7.83%        
2015-A Redeemed Notes [Member]          
Debt Instrument [Line Items]          
Amount of notes issued       $ 78,800  
Redemption price       114,100  
Adjustments       35,300  
Carrying value         $ 126,300
Debt issuance costs       $ 2,100  
Asset-backed Securities [Member]          
Debt Instrument [Line Items]          
Monthly fee percentage on outstanding balance 4.75% 4.75% 4.75%