Equity Method Investment in Change Healthcare LLC (Summarized Financial Information of the Joint Venture) (Details) - Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 808,226	$ 2,459,593
Cost of operations (exclusive of depreciation and amortization)	339,413	998,943
Customer postage	55,693	171,288
Net income (loss)	$ 31,191	$ 102,973