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Capitalized Software Costs - Capitalized Software Development Costs (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Mar. 31, 2019
Research And Development [Abstract]    
Gross carrying amount $ 68,879 $ 59,782
Accumulated amortization (29,803) (21,927)
Net capitalized software costs $ 39,076 $ 37,855