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Debt - Term Loans (Details)
$ in Thousands, ¥ in Millions
6 Months Ended
Mar. 31, 2019
CNY (¥)
loan
installment
Mar. 31, 2019
USD ($)
loan
installment
Dec. 31, 2018
loan
Debt Instrument [Line Items]      
Deferred financing costs   $ 6,107  
Outstanding principal balance   $ 549,605  
Secured Debt | Five-year Term Loans Maturing 2021      
Debt Instrument [Line Items]      
Number of term loans | loan 3 3 3
Debt instrument, term (in years) 5 years    
Face amount   $ 3,300  
Number of installments | installment 8 8  
Installment payment, percentage of initial principal amount (as a percent) 12.50% 12.50%  
Deferred financing costs   $ 0  
Outstanding principal balance   $ 2,100  
Secured Debt | Five-year Term Loans Maturing 2021 | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate (as a percent) 3.10%    
Secured Debt | One-year Term Loans Maturing 2019      
Debt Instrument [Line Items]      
Number of term loans | loan 2 2 2
Debt instrument, term (in years) 1 year    
Face amount ¥ 22 $ 3,200  
Outstanding principal balance   $ 1,800  
Secured Debt | One-year Term Loans Maturing 2019, Loan One      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage (as a percentage) 4.56% 4.56%  
Secured Debt | One-year Term Loans Maturing 2019, Loan Two      
Debt Instrument [Line Items]      
Debt instrument, interest rate, stated percentage (as a percentage) 4.35% 4.35%