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Capitalized Software Costs - Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Mar. 31, 2019
Research And Development [Abstract]    
Gross carrying amount $ 73,763 $ 59,782
Accumulated amortization (34,085) (21,927)
Net capitalized software costs $ 39,678 $ 37,855