Condensed Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings (Deficit) [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Total
Cumulative effect of accounting change of the Joint Venture | ASU 2017-12 [Member]			$ (490)	$ 490
Balance at Mar. 31, 2018	$ 75	$ 1,139,300	34,661	2,536	$ 1,176,572
Balance, shares at Mar. 31, 2018	75,749,118
Equity compensation expense		5,300			5,300
Repurchase of Change Healthcare Inc. common stock		(4,782)			(4,782)
Repurchase of Change Healthcare Inc. common stock, shares	(251,789)
Issuance of Change Healthcare Inc. common stock upon exercise of equity awards, shares	4,045
Net income (loss)			(17,501)		(17,501)
Foreign currency translation adjustment of the Joint Venture				(2,593)	(2,593)
Changes in fair value of interest rate swap, net of taxes				782	782
Balance at Jun. 30, 2018	$ 75	1,139,818	16,670	1,215	1,157,778
Balance, shares at Jun. 30, 2018	75,501,374
Balance at Mar. 31, 2018	$ 75	1,139,300	34,661	2,536	1,176,572
Balance, shares at Mar. 31, 2018	75,749,118
Net income (loss)					(36,092)
Foreign currency translation adjustment of the Joint Venture					(2,027)
Changes in fair value of interest rate swap, net of taxes					2,260
Balance at Sep. 30, 2018	$ 75	1,141,067	(1,921)	3,259	1,142,480
Balance, shares at Sep. 30, 2018	75,445,885
Balance at Jun. 30, 2018	$ 75	1,139,818	16,670	1,215	1,157,778
Balance, shares at Jun. 30, 2018	75,501,374
Equity compensation expense		2,969			2,969
Repurchase of Change Healthcare Inc. common stock		(1,720)			(1,720)
Repurchase of Change Healthcare Inc. common stock, shares	(90,629)
Issuance of Change Healthcare Inc. common stock upon exercise of equity awards, shares	35,139
Net income (loss)			(18,591)		(18,591)
Foreign currency translation adjustment of the Joint Venture				566	566
Changes in fair value of interest rate swap, net of taxes				1,478	1,478
Balance at Sep. 30, 2018	$ 75	1,141,067	(1,921)	3,259	1,142,480
Balance, shares at Sep. 30, 2018	75,445,885
Cumulative effect of accounting change of the Joint Venture | ASC 606 [Member]			35,797		35,797
Cumulative effect of accounting change of the Joint Venture | ASU 2018-02 [Member]			(422)	422
Balance at Mar. 31, 2019	$ 75	1,153,509	(17,841)	(3,256)	1,132,487
Balance, shares at Mar. 31, 2019	75,474,654
Equity compensation expense		5,862			5,862
Net income (loss)			(37,517)		(37,517)
Foreign currency translation adjustment of the Joint Venture				226	226
Changes in fair value of interest rate swap, net of taxes				(5,431)	(5,431)
Balance at Jun. 30, 2019	$ 75	1,159,371	(19,983)	(8,039)	1,131,424
Balance, shares at Jun. 30, 2019	75,474,654
Balance at Mar. 31, 2019	$ 75	1,153,509	(17,841)	(3,256)	1,132,487
Balance, shares at Mar. 31, 2019	75,474,654
Net income (loss)					(131,451)
Unrealized gain (loss) on available for sale debt securities of the Joint Venture					1,173
Foreign currency translation adjustment of the Joint Venture					1,809
Changes in fair value of interest rate swap, net of taxes					(6,741)
Balance at Sep. 30, 2019	$ 124	2,006,494	(113,918)	(6,593)	1,886,107
Balance, shares at Sep. 30, 2019	124,935,806
Balance at Jun. 30, 2019	$ 75	1,159,371	(19,983)	(8,039)	1,131,424
Balance, shares at Jun. 30, 2019	75,474,654
Issuance of Change Healthcare Inc. common stock upon initial public offering	$ 49	608,630			608,679
Issuance of Change Healthcare Inc. common stock upon initial public offering, shares	49,285,713
Effect of initial public offering issuance costs on Joint Venture equity		(4,160)			(4,160)
Issuance of tangible equity units		232,929			232,929
Equity compensation expense		8,585			8,585
Issuance of Change Healthcare Inc. common stock upon exercise of equity awards		1,139			1,139
Issuance of Change Healthcare Inc. common stock upon exercise of equity awards, shares	175,439
Net income (loss)			(93,935)		(93,935)
Unrealized gain (loss) on available for sale debt securities of the Joint Venture				1,173	1,173
Foreign currency translation adjustment of the Joint Venture				1,583	1,583
Changes in fair value of interest rate swap, net of taxes				(1,310)	(1,310)
Balance at Sep. 30, 2019	$ 124	$ 2,006,494	$ (113,918)	$ (6,593)	$ 1,886,107
Balance, shares at Sep. 30, 2019	124,935,806