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Supporting Financial Information - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Interest expense $ (334) $ (696) $ (1,242) $ (2,367)
Amortization of deferred financing costs (178) (197) (497) (610)
Interest expense, net $ (512) $ (893) $ (1,739) $ (2,977)