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Derivative Financial Instruments and Fair Value Measurements - Fair Value Measurements (Details) - Interest Rate Swap - USD ($) $ in Millions | Jun. 30, 2023 | Sep. 30, 2022
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Other current assets |  |
Derivative financial instruments |  |
Fair values of the interest rate swap and cap agreements | $ 17.9 | $ 9.4
Other non-current assets |  |
Derivative financial instruments |  |
Fair values of the interest rate swap and cap agreements | $ 30.3 | $ 41.8

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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480237/815-40-50-5 + Details
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