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Revenue - Performance Obligations and Contract Estimates (Details) $ in Millions	9 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($) project
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Standard assurance warranty, period	1 year
Remaining performance obligation, amount	$ 1,300.0
Changes in contract estimates related to projects in progress	14.2	$ 13.2
Projects cancelled | project		2
Change in contract estimates due to project cancellations	1.7	$ 3.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2024-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation, amount	$ 841.0
Remaining performance obligation, expected timing of satisfaction, period	12 months

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- Definition

Number of Projects Cancelled

+ References

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- Definition

Standard Assurance Warranty, Period

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No definition available.

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- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which increases (decreases) right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
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-Publisher FASB
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- Definition

Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in measure of progress which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-SubTopic 10
-Topic 606
-Publisher FASB
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Period in which remaining performance obligation is expected to be recognized as revenue, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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