Equity Method Investment in Change Healthcare LLC (Summarized Financial Information of the Joint Venture) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Equity Method Investment in Change Healthcare LLC [Abstract]
Net revenue	$ 3,092,875	$ 3,281,729	$ 3,298,843
Cost of operations (exclusive of depreciation and amortization)	1,263,244	1,354,655	1,407,893
Customer postage	215,448	238,618	274,397
Net income (loss)	123,771	176,670	$ 192,442
Current assets	1,339,908	980,463
Long-term assets	5,187,220	5,223,675
Current liabilities	1,112,875	889,783
Long-term liabilities	$ 5,185,304	$ 6,219,141