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Line of Credit (Details) - USD ($)
$ in Millions
6 Months Ended
Mar. 31, 2020
Sep. 30, 2019
Oct. 04, 2017
Line of Credit | Credit Agreement | Revolving Credit Facility      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity $ 75.0   $ 75.0
Line of credit, expiration date Oct. 04, 2022    
Outstanding line of credit $ 0.0 $ 0.0  
Deferred finance costs 0.3 $ 0.4  
Line of credit, remaining borrowing capacity $ 44.7    
Line of Credit | Credit Agreement | Revolving Credit Facility | Maximum      
Line of Credit Facility [Line Items]      
Line of credit, expiration period 90 days    
Line of Credit | Credit Agreement | Letter of Credit      
Line of Credit Facility [Line Items]      
Line of credit, maximum borrowing capacity     7.5
Secured Debt | Senior Secured Term Loan Facility      
Line of Credit Facility [Line Items]      
Face amount     $ 200.0