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Investments - Contractual Maturities of Available-For-Sale Debt Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]    
Due within one year $ 36,213 $ 72,307
Due in one year to three years 642,032 20,779
Total $ 678,245 $ 93,086