Intangible Assets - Intangible Assets, Other than Capitalized Software Development Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 88,450	$ 130,950
Accumulated amortization	(54,849)	(94,250)
Net intangible assets	33,601	36,700
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	39,200	39,200
Accumulated amortization	(27,218)	(26,349)
Net intangible assets	11,982	12,851
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	250	250
Accumulated amortization	(79)	(67)
Net intangible assets	171	183
Computer Software, Intangible Asset
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	49,000	91,500
Accumulated amortization	(27,552)	(67,834)
Net intangible assets	$ 21,448	$ 23,666