Leases - Assets and Liabilities - Operating Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 47,971	$ 49,650
Accrued expenses and other current liabilities	$ 5,342	$ 5,254
Operating Lease, Liability, Current, Statement of Financial Position	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Long-term operating lease liabilities	$ 43,802	$ 45,088
Total lease liability balance	$ 49,144	$ 50,342