Leases - Lessee Assets and Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021	Mar. 31, 2021
Leases [Abstract]
Right-of-use asset	$ 204,343	$ 200,990	$ 170,479
Lease liability, current	52,446	52,263	41,060
Lease liability, non-current	163,506	161,330	138,622
Total lease liability	$ 215,952	$ 213,593	$ 179,682