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Summary of Significant Accounting Policies - Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Accounting Policies [Abstract]    
Contract liability $ 4.6 $ 3.3
Contract asset 0.6 0.4
Contract liability recognized as revenue 3.2  
Contract costs 1.6 0.7
Capitalized contract cost, amortization $ 0.7 $ 0.4