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Separation Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Restructuring Cost and Reserve [Line Items]        
Restructuring and other, net $ 1,400 $ 0 $ 1,400 $ 11
Separation Costs        
Restructuring Cost and Reserve [Line Items]        
Restructuring and other, net $ 1,400