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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2024
Mar. 31, 2023
Income Tax Disclosure [Abstract]        
Current income tax expense $ 5 $ 2,100 $ 1,800 $ 5,200
Effective income tax rate 0.70% 21.80% 18.40% 22.40%