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Related Party Transactions (Details) - USD ($)
1 Months Ended 9 Months Ended 12 Months Ended
May. 20, 2014
Aug. 31, 2015
Jun. 19, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Related Party Transaction [Line Items]            
Repayments of interest       $ 16,472,000 $ 16,361,000 $ 12,553,000
Financing Agreement [Member] | Grupo Finmart [Member] | Investors [Member]            
Related Party Transaction [Line Items]            
Amounts due to related party   $ 3,500,000        
Financing Agreement [Member] | Grupo Finmart [Member] | Investors [Member] | Minimum [Member]            
Related Party Transaction [Line Items]            
Interest rate of related party loan   10.00%        
Financing Agreement [Member] | Grupo Finmart [Member] | Investors [Member] | Maximum [Member]            
Related Party Transaction [Line Items]            
Interest rate of related party loan   15.00%        
Financing Agreement [Member] | Grupo Finmart [Member] | Santiago Creel Miranda [Member]            
Related Party Transaction [Line Items]            
Amounts due to related party   $ 250,000        
Interest rate of related party loan   15.00%        
Repayments of interest       14,000    
Advisory Services Agreement [Member] | Madison Park, LLC [Member]            
Related Party Transaction [Line Items]            
Amounts due to related party       $ 0 $ 0  
Period of advisory services agreements         1 year 1 year
Expenses from transactions with related party     $ 5,200,000   $ 7,200,000 $ 7,200,000
Period for termination notice 30 days          
Consulting Agreement [Member] | LPG Limited (HK) [Member]            
Related Party Transaction [Line Items]            
Period of advisory services agreements         1 year 1 year
Expenses from transactions with related party         $ 259,000 $ 480,000