Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Lessee Lease Description [Line Items]
Operating lease, existence of option to extend	true
Operating lease, option to extend	Some of our leases include options to extend or terminate the lease prior to the end of the agreed upon lease term. For purposes of calculating lease liabilities, lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise such options.
Operating lease, existence of option to terminate	true
Operating lease, option to terminate	Some of our leases include options to extend or terminate the lease prior to the end of the agreed upon lease term. For purposes of calculating lease liabilities, lease terms include options to extend or terminate the lease when it is reasonably certain that we will exercise such options.
Cash payments related to operating leases	$ 6.6	$ 6.6	$ 6.7
Cash payments related to financing leases	0.4	0.4	0.5
Right of use assets obtained in exchange for lease obligations	$ 5.8	$ 2.9	$ 7.5
Minimum
Lessee Lease Description [Line Items]
Operating lease remaining term	1 year
Maximum
Lessee Lease Description [Line Items]
Operating lease remaining term	6 years