Leases - Assets and Liabilities - Operating Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Assets and Liabilities, Lessee [Abstract]
Operating lease right-of-use assets	$ 66,580	$ 54,059
Operating Lease, Right-of-Use Asset, Statement of Financial Position	Other assets	Other assets
Accrued expenses and other current liabilities	$ 9,499	$ 6,924
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	$ 60,436	$ 49,227
Total lease liability balance	$ 69,935	$ 56,151