Intangible Assets - Intangible Assets, Other than Capitalized Software Development Costs (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Mar. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 125,400	$ 148,760
Accumulated amortization	(77,958)	(96,165)
Net intangible assets	47,442	52,595
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	32,400	54,450
Accumulated amortization	(18,690)	(39,875)
Net intangible assets	13,710	14,575
Computer Software, Intangible Asset
Finite Lived Intangible Assets [Line Items]
Gross carrying amount	93,000	94,310
Accumulated amortization	(59,268)	(56,290)
Net intangible assets	$ 33,732	$ 38,020