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Fair Value Measurements - Additional Disclosures (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Oct. 27, 2017
Oct. 26, 2017
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2017
USD ($)
loan
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Jul. 31, 2017
USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Gain on restructured notes receivable     $ (3,000) $ 3,048 $ 0 $ 0  
Minimum              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Restructured notes receivable, estimated settlement amount     14,000 $ 14,000      
2019 Convertible Notes              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Debt repurchase amount             $ 35,000
Convertible Hedges and Embedded Derivative Financial Instruments | Recurring              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Expected volatility rate       36.00% 55.00%    
Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Restructured notes receivable, estimated settlement amount     14,000 $ 14,000      
Adjusted deferred compensation fee with early loan repayment     $ 10,000 10,000      
Principal collections on notes receivable       $ 29,500      
Number of promissory notes outstanding | loan     2 2      
Notes receivable, related party     $ 60,900 $ 60,900      
Notes receivable outstanding balance     18,300 $ 18,300      
Gain on restructured notes receivable     3,000        
Notes receivable, net (including accreted deferred compensation of $0.1 million) | Level 3 | Income Approach Valuation Technique | Minimum              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Notes receivable, interest rate       10.00%      
Fair value assumptions, discount rate       8.00%      
Notes receivable, net (including accreted deferred compensation of $0.1 million) | Level 3 | Income Approach Valuation Technique | Maximum              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Notes receivable, interest rate       14.50%      
Fair value assumptions, discount rate       15.00%      
Subsequent event | Notes receivable, net (including accreted deferred compensation of $0.1 million) | Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Expected term 2 years            
Subsequent event | Dollars denominated notes interest | Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Notes receivable, interest rate 10.00% 4.00%          
Subsequent event | Pesos denominated notes interest | Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Notes receivable, interest rate 14.50% 7.50%          
Fee Due Date One | Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Restructured notes receivable, estimated settlement amount     6,000 $ 6,000      
Fee Due Date Two | Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Restructured notes receivable, estimated settlement amount     4,000 4,000      
Fee Due Date Three | Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Restructured notes receivable, estimated settlement amount     4,000 4,000      
Escrow subject to indemnification claims | Not primary beneficiary, variable interest              
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]              
Escrow Deposit     $ 4,100 $ 4,100