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DEBT - Credit Facilities (Details) $ in Millions | Jun. 08, 2022 USD ($) | Apr. 08, 2022 USD ($) | Jul. 05, 2018 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 | Sep. 30, 2020
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Debt Instrument [Line Items] |  |  |  |  |  |
Debt, weighted average interest rate (percentage) |  |  |  | 3.60% | 3.70% | 4.30%
Debt Instrument, Redemption, Period Two |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  |  |  | 6.50 |  |
Debt Instrument, Redemption, Period Three |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  |  |  | 6.25 |  |
Debt Instrument, Redemption, Period Four |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  |  |  | 5.50 |  |
Debt Instrument, Redemption, Period Five |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  |  |  | 4.50 |  |
Fifth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facilities, maximum borrowing capacity |  |  | $ 2,300.0 |  |  |
Leverage ratio |  |  |  | 6.01 |  |
Interest coverage ratio |  |  |  | 4.83 |  |
Fifth Amended And Restated Senior Secured Credit Agreement | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest coverage ratio |  |  |  | 3.00 |  |
Sixth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facilities, maximum borrowing capacity |  | $ 2,500.0 |  |  |  |
Outstanding debt |  |  |  | $ 2,875.5 |  |
Sixth Amended And Restated Senior Secured Credit Agreement | Debt Instrument, Redemption, Period One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum leverage ratio |  |  |  | 6.25 |  |
Credit Facilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facilities, available borrowing capacity |  |  |  | $ 1,185.5 |  |
Credit Facilities | Fifth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, maturity period (in years) |  |  | 5 years |  |  |
Credit Facilities | Sixth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, maturity period (in years) |  | 5 years |  |  |  |
Revolving loans |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, weighted average interest rate (percentage) |  |  |  | 2.80% | 1.90% | 3.30%
Revolving loans | Sixth Amended And Restated Senior Secured Credit Agreement, Amendment One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, increase (decrease) | 35 |  |  |  |  |
Annual facility fee rate increase (decrease) | 15 |  |  |  |  |
Maximum leverage ratio | 4.75 |  |  |  |  |
Cash dividends, annual maximum | $ 225.0 |  |  |  |  |
Maximum other dividends and distributions | $ 25.0 |  |  |  |  |
Letter of Credit | Credit Facilities |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Aggregate face amount of letters of credit outstanding |  |  |  | $ 14.1 |  |
Revolving loans | Fifth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facilities, maximum borrowing capacity |  |  | $ 1,500.0 |  |  |
Revolving loans | Sixth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facilities, maximum borrowing capacity |  | $ 1,500.0 |  |  |  |
Letters of credit |  | 100.0 |  |  |  |
Additional committed credit |  | 500.0 |  |  |  |
Secured Term Loan | Fifth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facilities, maximum borrowing capacity |  |  | 800.0 |  |  |
Letters of credit |  |  | $ 75.0 |  |  |
Secured Term Loan | Sixth Amended And Restated Senior Secured Credit Agreement |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior secured credit facilities, maximum borrowing capacity |  | $ 1,000.0 |  |  |  |
Secured Term Loan | Sixth Amended And Restated Senior Secured Credit Agreement, Amendment One |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Interest rate, increase (decrease) | 50 |  |  |  |  |

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- Definition Amount of additional committed credit under the agreement, subject to certain specified financial and other conditions + References No definition available. + Details
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- Definition Facility will be available for issuance of letters of credit up to this amount + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition Fair value of the amount outstanding under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI https://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 + Details
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