Debt - Revolving Line of Credit (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Debt Instrument [Line Items]
Proceeds from revolving line of credit	$ 0	$ 0	$ 12,000
Repayments of line of credit	$ 0	$ 33,881	$ 12,000