Leases - Lessee Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023
Lease assets:
Operating lease right-of-use assets	$ 235,030	$ 234,388	$ 243,100
Financing lease assets	1,832	2,178	2,076
Total lease assets	236,862	236,566	245,176
Current:
Operating lease liabilities	58,905	57,182	56,919
Financing lease liabilities	596	530	472
Total current lease liabilities	59,501	57,712	57,391
Non-current:
Operating lease liabilities	188,996	193,187	197,499
Financing lease liabilities	1,352	1,715	1,645
Total non-current lease liabilities	190,348	194,902	199,144
Total lease liabilities	$ 249,849	$ 252,614	$ 256,535
Finance Lease, Other Assets, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent	Other Assets, Noncurrent
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accounts payable, accrued expenses and other current liabilities	Accounts payable, accrued expenses and other current liabilities	Accounts payable, accrued expenses and other current liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent	Other Liabilities, Noncurrent