Intangible Assets - Intangible Assets, Other than Capitalized Software Development Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 130,950	$ 153,150
Accumulated amortization	(94,250)	(95,341)
Net intangible assets	36,700	57,809
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	39,200	39,200
Accumulated amortization	(26,349)	(21,951)
Net intangible assets	12,851	17,249
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	250	250
Accumulated amortization	(67)	(17)
Net intangible assets	183	233
Computer Software, Intangible Asset
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	91,500	113,700
Accumulated amortization	(67,834)	(73,373)
Net intangible assets	$ 23,666	$ 40,327