Segment Reporting - Schedule of Percentages of Revenues Attributable to Patient Management and Network Solutions Services (Detail) - Product Concentration Risk [Member] - Sales Revenue, Services, Net [Member]	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Revenue, Major Customer [Line Items]
Percentage of revenues	100.00%	100.00%	100.00%
Patient Management Services [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues	61.80%	56.70%	55.60%
Network Solutions Services [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues	38.20%	43.30%	44.40%