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	6 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Schedule of Equity Method Investments [Line Items]
Total revenue	$ 795,811	$ 1,651,367
Cost of operations (exclusive of depreciation and amortization)	331,234	658,181
Customer postage	57,110	115,594
Net income (loss)	$ (130)	$ 71,785