Tax Receivable Agreements (McKesson Tax Receivable Agreement - Aggregate Payments Due Under Tax Receivable Agreements) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020
Related Party Transaction [Line Items]
Remainder of 2021
2022	22,394
2023	67,468
2024	45,909
2025	26,358
Thereafter	132,420
Gross expected payments	294,549
Less: Amounts representing discount	(111,285)
Total tax receivable agreement obligations due to related parties	183,264
Less: Current portion due	(22,394)
Tax receivable agreement long-term obligations due to related parties	160,870	$ 177,826
McKesson Tax Receivable Agreement [Member]
Related Party Transaction [Line Items]
Remainder of 2021
2022	128
2023	18,306
2024	19,905
2025	23,150
Thereafter	103,144
Gross expected payments	164,633
Total tax receivable agreement obligations due to related parties	164,633
Less: Current portion due	(128)
Tax receivable agreement long-term obligations due to related parties	$ 164,505