Intangible Assets, Goodwill and Acquisitions - Additional Information (Details) $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Company
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 13.4	$ 13.9
Number of unrelated maintenance services companies acquired | Company		3
Consideration paid, net of cash acquired	$ 6.0	$ 62.2
Number of unrelated companies allocated between maintenance services and development services | Company		1
Unrelated Maintenance Services Companies
Finite Lived Intangible Assets [Line Items]
Acquisition of operations, Percentage		100.00%
Consideration paid, net of cash acquired		$ 62.2