Tax Receivable Agreements (Narrative) (Details)	6 Months Ended
	Sep. 30, 2020
Tax Receivable Agreements 2009-2011 [Member]
Related Party Transaction [Line Items]
Net cash tax savings, percentage payment provided by agreement	85.00%
McKesson Tax Receivable Agreement [Member]
Related Party Transaction [Line Items]
Net cash tax savings, percentage payment provided by agreement	85.00%
McKesson Tax Receivable Agreement [Member] | Joint Venture [Member]
Related Party Transaction [Line Items]
Maximum percentage ownership allowed to receive net cash tax savings payment	20.00%