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Fair Value Measurements, Derivatives and Other - Additional Disclosures (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Apr. 26, 2013
Jun. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Jan. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Change in contingent consideration, increase (decrease)     $ 0 $ 0 $ (4,792)  
Grupo Finmart            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Acquisition interest           60.00%
Level 3 | Convertible Senior Notes | Income Approach Valuation Technique | Minimum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value assumptions, discount rate     9.00%      
Level 3 | Convertible Senior Notes | Income Approach Valuation Technique | Maximum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value assumptions, discount rate     22.00%      
Level 3 | Redeemable Noncontrolling Interest | Income Approach Valuation Technique | Minimum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value assumptions, discount rate     5.00%      
Level 3 | Redeemable Noncontrolling Interest | Income Approach Valuation Technique | Maximum            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value assumptions, discount rate     10.00%      
Level 3 | Total Temporary Equity | Income Approach Valuation Technique            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Fair value assumptions, discount rate     7.00%      
Recurring            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Contingent consideration       2,601    
Recurring | Level 3            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Change in contingent consideration, increase (decrease)   $ (1,100)        
Contingent consideration   $ 1,500   $ 2,601    
Grupo Finmart | Fondo ACH, S.A. de C.V.            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Acquisition interest 100.00%          
Period for determination 4 years          
Phantom stock            
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]            
Value of shares settled and released     $ 100      
Reclassification to equity awards     $ 3,800