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Indebtedness - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Mar. 31, 2021
Mar. 15, 2021
Dec. 13, 2019
Line of Credit Facility [Line Items]      
Revolving loan maximum borrowing capacity     $ 150,000
Weighted average interest rate on debt 0.50%    
Debt issuance costs   $ 2,600  
LIBOR | Minimum      
Line of Credit Facility [Line Items]      
Debt instrument, margin spread on LIBOR Rate 1.25%    
LIBOR | Maximum      
Line of Credit Facility [Line Items]      
Debt instrument, margin spread on LIBOR Rate 3.25%    
Term loan      
Line of Credit Facility [Line Items]      
Revolving loan maximum borrowing capacity     50,000
Revolving loan      
Line of Credit Facility [Line Items]      
Revolving loan maximum borrowing capacity   $ 200,000 $ 100,000