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Debt - Effective Interest Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Debt
Effective interest rate including effects of interest rate swap agreements	5.60%	5.30%	3.80%
Amortization of deferred debt issuance costs	$ 7.6	$ 4.9	$ 4.9

X

- Definition

Amount of amortization expense attributable to debt issuance costs.

+ References

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No definition available.

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X

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
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