Legal Matters and Contingencies (Details) $ in Thousands		3 Months Ended			12 Months Ended
	Oct. 21, 2019 USD ($)	Sep. 30, 2020 USD ($) numberOfDistributors	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($) numberOfDistributors	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jul. 01, 2018 USD ($)
Loss Contingencies [Line Items]
Litigation settlement						$ 6,722,346	$ 185,145	$ 61,527
Annual fund commitment total									$ 100,000
Estimated liability under the New York Opioid Stewardship Act		$ (14,800)	$ (22,000)	$ 22,000
Settlement with Ohio Counties
Loss Contingencies [Line Items]
Litigation settlement						66,700
MDL and Other Related State Court Litigation
Loss Contingencies [Line Items]
Aggregate legal settlement (up to)	$ 18,000,000
Legal settlement term (in years)	18 years
Company's portion of aggregate legal settlement	31.00%
Program period (in years)	10 years
Opioid Lawsuits and Investigations
Loss Contingencies [Line Items]
Litigation settlement		$ 6,600,000
Legal settlement term (in years)		18 years
Estimated payment		$ 6,200,000				$ 6,200,000
Opioid Lawsuits and Investigations | Pending Litigation
Loss Contingencies [Line Items]
Legal settlement term (in years)						18 years
Number of U.S. pharmaceutical distributors in settlement | numberOfDistributors		3				3
Global settlement		$ 21,000,000				$ 21,000,000
Estimated payment		$ 6,500,000				$ 6,500,000
Opioid Lawsuits and Investigations | Forecast
Loss Contingencies [Line Items]
Litigation settlement, payment					$ 408,000