Debt (schedule of Deferred Financing Fees and Discounts (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Unamortized discount (premium) and debt issuance costs, net	$ 10,812	$ 11,738
First Lien Term Facility, due December 20, 2024
Debt Instrument [Line Items]
Unamortized discount (premium) and debt issuance costs, net	(10,812)	(11,738)
First Lien Term Facility, due December 20, 2024 | Other Current Liabilities
Debt Instrument [Line Items]
Unamortized discount (premium) and debt issuance costs, net	(1,883)	(1,866)
First Lien Term Facility, due December 20, 2024 | Other Noncurrent Liabilities
Debt Instrument [Line Items]
Unamortized discount (premium) and debt issuance costs, net	$ (8,929)	$ (9,872)