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Capitalized Software Costs - Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 31, 2021
Research And Development [Abstract]    
Gross carrying amount $ 106,810 $ 96,908
Accumulated amortization (65,240) (55,434)
Net capitalized software costs $ 41,570 $ 41,474