Business Combinations (The Merger - Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands			1 Months Ended	12 Months Ended
	Mar. 10, 2020	Jul. 01, 2019	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Jun. 26, 2019
Business Acquisition [Line Items]
Common Stock, par value			$ 0.001	$ 0.001	$ 0.001		$ 0.001
Total revenue				$ 3,090,421	$ 196,792
Loss from Equity Method Investment in the Joint Venture					$ 380,713	$ 70,487
Joint Venture [Member]
Business Acquisition [Line Items]
Ownership percentage		41.00%
Ownership percentage acquired in exchange				30.00%
Total revenue			$ 196,792
Loss from Equity Method Investment in the Joint Venture			$ 4,288
Joint Venture [Member] | Prior to Merger [Member]
Business Acquisition [Line Items]
Percentage of remaining equity interest being acquired	58.00%
Loss from Equity Method Investment in the Joint Venture	$ 230,229
Change Common Stock [Member] | SpinCo [Member]
Business Acquisition [Line Items]
Ownership percentage	42.00%
The Merger [Member]
Business Acquisition [Line Items]
Common Stock, par value	$ 0.001
Number of shares of equity interests issued	175,995,192
The Merger [Member] | McKesson Common Stock [Member]
Business Acquisition [Line Items]
Common Stock, par value	$ 0.01
Number of shares of equity interests issued	15,426,537
The Merger [Member] | McKesson Common Stock [Member] | Held by Pre-Merger Holders [Member]
Business Acquisition [Line Items]
Ownership percentage	58.00%
The Merger [Member] | SpinCo Common Stock [Member]
Business Acquisition [Line Items]
Common Stock, par value	$ 0.001
Number of shares of equity interests issued	175,995,192
The Merger [Member] | Change Common Stock [Member]
Business Acquisition [Line Items]
Common Stock, par value	$ 0.001
The Merger [Member] | Change Common Stock [Member] | Held by Pre-Merger Holders [Member]
Business Acquisition [Line Items]
Ownership percentage	42.00%