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Capitalized Software Costs - Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Research And Development [Abstract]    
Gross carrying amount $ 91,243 $ 75,212
Accumulated amortization (50,153) (38,208)
Net capitalized software costs $ 41,090 $ 37,004