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FAIR VALUE MEASUREMENTS - Summary of Fair Value of Assets and Liabilities (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Aug. 13, 2021 | Mar. 17, 2021 | Oct. 22, 2019 | Dec. 15, 2016
--- | --- | --- | --- | --- | --- | --- | ---
Senior Notes | Senior Notes due 2031 – 4.000% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate (percent) | 4.00% | 4.00% |  |  | 4.00% |  |
Senior Notes | Senior Notes due 2032 – 4.375% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate (percent) | 4.375% | 4.375% |  | 4.375% |  |  |
Senior Notes | Senior Notes - 4.500% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate (percent) | 4.50% | 4.50% |  |  |  | 4.50% |
Senior Notes | Senior Notes due 2026 – 5.250% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Interest rate (percent) | 5.25% | 5.25% |  |  |  |  | 5.25%
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2031 – 4.000% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | $ 500.0 | $ 500.0 |  |  |  |  |
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2032 – 4.375% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 400.0 | 400.0 |  |  |  |  |
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes - 4.500% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 450.0 | 450.0 |  |  |  |  |
Reported Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2026 – 5.250% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 250.0 | 250.0 |  |  |  |  |
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 0.0 | 88.3 |  |  |  |  |
Reported Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 625.0 | 925.0 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2031 – 4.000% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 456.3 | 380.0 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2032 – 4.375% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 370.0 | 304.0 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes - 4.500% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 432.0 | 366.8 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Senior Notes | Senior Notes due 2026 – 5.250% |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 248.8 | 233.1 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Revolving loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 0.0 | 88.3 |  |  |  |  |
Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Credit Facilities | Term loans |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 625.0 | 925.0 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | 51.2 | 1.2 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 32.4 | 36.3 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 0.0 | 0.4 |  |  |  |  |
Fair Value, Measurements, Recurring | Reported Value Measurement | Fair value, inputs, level 3 | Convertible debt investments |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Convertible debt investments | 45.8 | 85.8 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Cash equivalents | 51.2 | 1.2 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 1 | Investment securities in non-qualified retirement plan assets |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Other | 32.4 | 36.3 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 2 | Other Long-term Debt |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |
Long-term debt | 0.0 | 0.4 |  |  |  |  |
Fair Value, Measurements, Recurring | Estimate of Fair Value Measurement | Fair value, inputs, level 3 | Convertible debt investments |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |
Convertible debt investments | $ 45.8 | $ 85.8 | $ 117.0 |  |  |  |

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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