Intangible Assets - Intangible Assets, Other than Capitalized Software Development Costs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Mar. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 153,150	$ 148,760
Accumulated amortization	(95,341)	(96,165)
Net intangible assets	57,809	52,595
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	39,200	54,450
Accumulated amortization	(21,951)	(39,875)
Net intangible assets	17,249	14,575
Trade Names
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	250
Accumulated amortization	(17)
Net intangible assets	233
Computer Software, Intangible Asset
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	113,700	94,310
Accumulated amortization	(73,373)	(56,290)
Net intangible assets	$ 40,327	$ 38,020