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Debt and Capital Lease Obligations - Asset Backed Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 30, 2017
Jan. 31, 2017
Jan. 31, 2016
Debt Instrument [Line Items]      
Amount of notes issued $ 1,703,580    
Proceeds from Securitizations of Consumer Loans 1,651,291    
Monthly fee percentage on outstanding balance   4.75%  
2015 Class B Notes [Member]      
Debt Instrument [Line Items]      
Amount of notes issued 165,900    
Proceeds from Securitizations of Consumer Loans $ 156,200    
Fixed annual rate 8.50%    
Effective interest rate 15.60%    
2016-A Class A Notes [Member]      
Debt Instrument [Line Items]      
Amount of notes issued $ 423,030    
Proceeds from Securitizations of Consumer Loans $ 409,845    
Fixed annual rate 4.68%    
Effective interest rate 6.50%    
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 9.60%    
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 11.00%    
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 5.70%    
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 8.10%    
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 5.50%    
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 6.00%    
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 7.90%    
Asset-backed Securities [Member]      
Debt Instrument [Line Items]      
Monthly fee percentage on outstanding balance 4.75% 4.75% 4.75%