Tax Receivable Agreements (Aggregate Payments Due Under Tax Receivable Agreements - McKesson Tax Receivable Agreement) (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Related Party Transaction [Line Items]
2021	$ 20,234
2022	22,394
2023	67,468
2024	45,909
2025	26,358
Thereafter	132,421
Gross expected payments	314,784
Less: Amounts representing discount	(116,724)
Total tax receivable agreement obligations due to related parties	198,060
Less: Current portion due	(20,234)
Tax receivable agreement long-term obligations due to related parties	177,826
McKesson Tax Receivable Agreement [Member]
Related Party Transaction [Line Items]
2021
2022	128
2023	18,306
2024	19,905
2025	23,150
Thereafter	103,144
Gross expected payments	164,633
Less: Amounts representing discount
Total tax receivable agreement obligations due to related parties	164,633
Less: Current portion due
Tax receivable agreement long-term obligations due to related parties	$ 164,633