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Fair Value Measurements - Additional Disclosures (Details) - USD ($)
$ in Thousands
12 Months Ended
Apr. 26, 2013
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Aug. 31, 2015
Jun. 30, 2014
Apr. 01, 2013
Jan. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Change in contingent consideration, increase (decrease)   $ 0 $ (4,792) $ 0        
Change in contingent consideration, individually immaterial adjustments, increase (decrease)     600          
Go Cash, LLC [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Change in contingent consideration, increase (decrease)     (4,800)          
Grupo Finmart [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Acquisition interest               60.00%
Change in contingent consideration, increase (decrease)   (1,200)            
Earn out payment related to Grupo Finmart acquisition     12,000          
Convertible Senior Notes [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Redemption value   $ 230,000            
All Entities Excluding Grupo Finart [Member] | Consumer Loan [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Loan term   12 months            
Grupo Finmart [Member] | Fondo ACH, SA de CV [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Acquisition interest 100.00%              
Performance-based purchase price, period of determination 4 years              
Grupo Finmart [Member] | Consumer Loan [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Loan term   30 months            
Fair Value, Inputs, Level 2 [Member] | Convertible Debt [Member] | Income Approach Valuation Technique [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Fair value assumptions, discount rate   7.00%            
Fair Value, Inputs, Level 3 [Member] | Redeemable Noncontrolling Interest [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Fair value assumptions, discount rate   5.00%            
Fair Value, Inputs, Level 3 [Member] | Redeemable Noncontrolling Interest [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Fair value assumptions, discount rate   10.00%            
Fair Value, Inputs, Level 3 [Member] | Temporary Equity [Member] | Income Approach Valuation Technique [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Fair value assumptions, discount rate   7.00%            
Recurring [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Contingent consideration   $ 2,601 3,758          
Recurring [Member] | Fair Value, Inputs, Level 2 [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Contingent consideration   0 0          
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Contingent consideration   $ 2,601 $ 3,758          
Grupo Finmart [Member]                
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]                
Ownership interest in subsidiaries   94.00%     94.00% 76.00% 60.00%