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Fair Value Measurements - Additional Disclosures (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Mar. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Expected term in years   6 years  
Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Discount rate 7.00%    
Level 3 | Redeemable Noncontrolling Interest | Income approach | Maximum      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Discount rate 24.00%    
All Entities Excluding Grupo Finart | Consumer Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Expected term in years 12 months    
Grupo Finmart | Consumer Loan      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Expected term in years 30 months    
Recurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration $ (2,575) $ (2,601) $ (2,914)
Phantom Share-based Awards   3,932  
Recurring | Level 2      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration 0 0 0
Phantom Share-based Awards   0  
Recurring | Level 3      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration (2,575) (2,601) $ (2,914)
Phantom Share-based Awards   $ 3,932  
Phantom Share Units      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Value of shares settled and released 100    
Reclassification to equity awards $ 3,800