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Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Interest Rate Swap and Interest Rate Cap | Other current assets
Derivative financial instruments
Fair values of the interest rate swap and cap agreements	$ 9.4
Interest Rate Swap and Interest Rate Cap | Other non-current assets
Derivative financial instruments
Fair values of the interest rate swap and cap agreements	41.8
Interest Rate Swap | Other non-current assets
Derivative financial instruments
Fair values of the interest rate swap and cap agreements		$ 1.2
Interest Rate Swap | Other current liabilities
Derivative financial instruments
Fair values of the interest rate swap and cap agreements		5.0
Interest Rate Swap | Other long-term liabilities
Derivative financial instruments
Fair values of the interest rate swap and cap agreements		$ 1.8
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap
Derivative financial instruments
Losses recognized in income	$ 0.0

X

- Definition

Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958

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- Definition

Amount of gain (loss) from excluded component of derivative hedge, recognized in earnings. Excludes recognition under systematic and rational method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 20
-Section 45
-Paragraph 1A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121577181&loc=SL110061172-113977

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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