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Fair Value Measurements (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Sep. 30, 2022
Apr. 01, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Unrealized loss on investments     $ 1,208    
Mar Cor          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Earn Out asset         $ 7,824
Increase in fair value of earn out $ 703 $ 3,773      
Mar Cor | Significant Unobservable Inputs (Level 3)          
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]          
Earn Out asset $ 0   $ 0 $ 11,597