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DEBT - Narrative (Details)	Jun. 30, 2021 USD ($) letter_of_credit	Apr. 16, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 20, 2018 USD ($)	Nov. 13, 2018 USD ($)
Debt Instrument [Line Items]
Face Amount	$ 487,148,000		$ 487,148,000
Number of letters of credit outstanding | letter_of_credit	2
Company 2025 Notes
Debt Instrument [Line Items]
Face Amount				$ 487,100,000
Interest rate				4.65%
2018 Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 750,000,000.0
Borrowings outstanding	$ 0
Available borrowing capacity	750,000,000.0
2018 Credit Facility | Letters of Credit
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 75,000,000.0
2018 Credit Facility, Due November 2025
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 680,000,000.0
2018 Credit Facility, Due November 2024
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 70,000,000.0
Letter of Credit - Instrument 1 | Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	24,800,000
Letter of Credit - Instrument 3 | Letters of Credit
Debt Instrument [Line Items]
Letters of credit outstanding	2,100,000
Unsecured Standalone Line of Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	20,000,000.0
Borrowings outstanding	$ 1,800,000

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- Definition

Number Of Letters Of Credit Outstanding

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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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.

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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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.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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