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Contract Revenue and Pass-through and Other Revenue - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Disaggregation Of Revenue [Line Items]
Deferred Revenue	$ 15.3
Deferred revenue recognized	5.6		$ 11.4	$ 3.0
Lease revenue	$ 20.2	$ 34.9	$ 123.0	$ 144.7	$ 158.4
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Contract revenue	Contract revenue	Contract revenue	Contract revenue	Contract revenue

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