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Fair Value Measurements Available-for-sale securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Debt Securities, Available-for-sale [Line Items]        
Equity Securities, FV-NI, Gain (Loss) $ (213) $ (384) $ (229) $ (74)