Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Payables and Accruals [Abstract]
Salaries, wages, and other benefits	$ 62,154	$ 79,110
Obligation under operating leases	13,066	13,316
Obligation under finance leases	12,124	12,093
Third party commissions	10,274	10,031
Taxes, other than income	4,941	4,575
Insurance liabilities	3,845	3,720
Provision for litigation	3,078	2,938
Severance payments	282	304
Fair value of liability derivatives	185	554
Earn-outs related to acquisitions	50	150
Other	34,445	33,576
Accrued expenses and other liabilities	$ 144,444	$ 160,367
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities	Accrued expenses and other liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other liabilities