Summary of Significant Accounting Policies - Intangible Assets (Details)	9 Months Ended
	Dec. 31, 2018
Acquired backlog
Finite-Lived Intangible Assets [Line Items]
Useful life	1 year
Software | Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life	2 years
Software | Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life	10 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Useful life	6 years