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Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 28, 2018
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Sep. 30, 2019
Derivative [Line Items]            
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred       $ (187)    
Interest rate cap amortization to be recognized in earnings within twelve months       $ 0    
Description of Reclassification of Cash Flow Hedge Gain (Loss)       P12M    
Write off of Deferred Debt Issuance Cost       $ 1,795 $ 0  
Document Period End Date       Jun. 30, 2020    
Interest Rate Cap            
Derivative [Line Items]            
Derivative, Term of Contract 3 years          
Write off of Deferred Debt Issuance Cost       $ 1,118    
Derivative, Cap Interest Rate 3.50%          
Cash paid for interest rate cap $ 2,235          
Unamortized Premium, Interest Rate Cap   $ 0   0   $ 1,614
Amortization   124 $ 187 496 $ 435  
Foreign Exchange Forward            
Derivative [Line Items]            
Derivative, Notional Amount   $ 17,866   17,866    
Designated as Hedging Instrument | Interest Rate Swap [Member]            
Derivative [Line Items]            
Derivative, Term of Contract   5 years        
Derivative, Notional Amount   $ 500,000   $ 500,000    
Derivative, Fixed Interest Rate   0.5455%   0.5455%    
Designated as Hedging Instrument | Interest Rate Cap            
Derivative [Line Items]            
Derivative, Notional Amount $ 600,000          
Prepaid Expenses and Other Current Assets | Interest Rate Cap            
Derivative [Line Items]            
Unamortized Premium, Interest Rate Cap   $ 0   $ 0   745
Other Noncurrent Assets [Member] | Interest Rate Cap            
Derivative [Line Items]            
Unamortized Premium, Interest Rate Cap   $ 0   $ 0   $ 869