Property and Equipment, Net - Schedule of Property and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2024	Sep. 30, 2023
Property Plant And Equipment [Line Items]
Property and equipment	$ 934.5	$ 857.4
Less: Accumulated depreciation	542.6	542.2
Property and equipment, net	391.9	315.2
Land
Property Plant And Equipment [Line Items]
Property and equipment	42.9	44.7
Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment	46.7	45.6
Operating Equipment
Property Plant And Equipment [Line Items]
Property and equipment	388.3	338.8
Transportation Vehicles
Property Plant And Equipment [Line Items]
Property and equipment	403.1	351.9
Office Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment	48.6	68.7
Construction in Progress
Property Plant And Equipment [Line Items]
Property and equipment	$ 4.9	$ 7.7
Minimum | Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	2 years
Minimum | Operating Equipment
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	2 years
Minimum | Transportation Vehicles
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	3 years
Minimum | Office Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	3 years
Maximum | Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	40 years
Maximum | Operating Equipment
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	7 years
Maximum | Transportation Vehicles
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	7 years
Maximum | Office Equipment and Software
Property Plant And Equipment [Line Items]
Property and equipment, Useful Life	10 years