Intangible Assets, Goodwill and Acquisitions - Additional Information (Details) $ in Millions	3 Months Ended
	Dec. 31, 2022 USD ($) Company	Dec. 31, 2021 USD ($)
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 11.9	$ 13.4
Number of unrelated maintenance services companies acquired | Company	2
Consideration paid, net of cash acquired	$ 10.0	6.0
Net Service Revenues	$ 655.9	$ 591.8
Unrelated Maintenance Services Companies
Finite Lived Intangible Assets [Line Items]
Acquisition of operations, Percentage	100.00%
Consideration paid, net of cash acquired	$ 10.0
Business Acquisitions
Finite Lived Intangible Assets [Line Items]
Net Service Revenues	2.3
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Identifiable assets acquired related to intangible assets	$ 2.6