Tax Receivable Agreements (Aggregate Payments Due Under Tax Receivable Agreements (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Related Party Transaction [Line Items]
2023	$ 46,901
2024	37,399
2025	73,822
2026	123,169
Thereafter	152,885
Gross expected payments	434,176
Less: Amounts representing discount	(92,982)
Total tax receivable agreement obligations	341,194
Less: Current portion due	(46,901)
Tax receivable agreement long-term obligations	294,293
Related Party Tax Receivable Agreements [Member]
Related Party Transaction [Line Items]
2023	11,392
2024	10,626
2025	37,213
2026	46,623
Thereafter	63,323
Gross expected payments	169,177
Less: Amounts representing discount	(60,179)
Total tax receivable agreement obligations	108,998
Less: Current portion due	(11,392)
Tax receivable agreement long-term obligations	97,606
McKesson Tax Receivable Agreement [Member]
Related Party Transaction [Line Items]
2023	24,748
2024	16,478
2025	20,052
2026	57,196
Thereafter	39,785
Gross expected payments	158,259
Total tax receivable agreement obligations	158,259
Less: Current portion due	(24,748)
Tax receivable agreement long-term obligations	133,511
Other Tax Receivable Agreements [Member]
Related Party Transaction [Line Items]
2023	10,761
2024	10,295
2025	16,557
2026	19,350
Thereafter	49,777
Gross expected payments	106,740
Less: Amounts representing discount	(32,803)
Total tax receivable agreement obligations	73,937
Less: Current portion due	(10,761)
Tax receivable agreement long-term obligations	$ 63,176