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DEBT - Narrative (Details) |  |  |  |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 03, 2021 USD ($) | Jun. 30, 2020 USD ($) | Sep. 24, 2019 USD ($) | Sep. 20, 2016 USD ($) | May 20, 2015 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 29, 2020 USD ($) | Sep. 20, 2016 EUR (€) | Feb. 28, 2015 USD ($) | Dec. 04, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  | $ 35,600,000 | $ 36,500,000 |  |  |  |  |
Gain from extinguishment of Salus CLO debt |  |  |  |  |  | 0 | 76,200,000 | $ 0 |  |  |  |
Long-term debt |  |  |  |  |  | 2,440,900,000 |  |  |  |  |  |
Salus | Collateralized Loan Obligations |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Aggregate notional principle amount |  |  |  |  |  |  |  |  |  |  | $ 578,500,000 |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  | 100,000 |  |  |  |  |
Debt issuance costs, gross |  |  |  |  |  |  | 700,000 |  |  |  |  |
Gain from extinguishment of Salus CLO debt |  |  |  |  |  | $ 76,200,000 |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | $ 77,000,000 |  |  |  |  |
Term Loan Facility, variable rate, due March 3, 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 2.50% |  |  |  |  |  |
5.50% Notes, due July 15, 2030 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 5.50% | 5.50% |  |  |  |  |
5.00% Notes, due October 1, 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.00% |  |  | 5.00% | 5.00% |  |  |  |  |
Aggregate borrowing amount |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default |  |  |  |  |  | 25.00% |  |  |  |  |  |
Capitalized debt issuance costs |  |  | $ 4,100,000 |  |  |  |  |  |  |  |  |
4.00% Notes, due October 1, 2026 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 4.00% | 4.00% |  |  | 4.00% |  |
Aggregate borrowing amount | € |  |  |  |  |  |  |  |  |  | € 425,000,000 |  |
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default |  |  |  |  |  |  |  |  |  | 25.00% |  |
Capitalized debt issuance costs |  |  |  | $ 7,700,000 |  |  |  |  |  |  |  |
5.75% Notes, due July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.75% | 5.75% | 5.80% |  |  |  |  |
Aggregate borrowing amount |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Capitalized debt issuance costs |  |  |  |  | $ 19,700,000 |  |  |  |  |  |  |
Repurchase amount |  |  |  |  |  | $ 550,000,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt, before write off of debt issuance costs |  |  |  |  |  | 17,700,000 |  |  |  |  |  |
Write off of deferred debt issuance costs |  |  |  |  |  | $ 5,700,000 |  |  |  |  |  |
6.125% Notes, due December 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 6.125% | 6.10% |  |  |  |  | 6.125%
Aggregate borrowing amount |  |  |  |  |  |  |  |  |  |  |  | $ 250,000,000
Debt issuance costs, gross |  |  |  |  |  |  |  |  |  |  |  | $ 4,600,000
Repurchase amount |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |
Gain (loss) on extinguishment of debt, before write off of debt issuance costs |  |  |  |  |  | 5,700,000 |  |  |  |  |  |
Write off of deferred debt issuance costs |  |  |  |  |  | $ 2,100,000 |  |  |  |  |  |
Senior Notes | Notes 3.875% Due July March 15, 2031 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 3.875% |  |  |  |  |  |  |  |  |  |  |
Aggregate borrowing amount | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, gross | $ 7,600,000 |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Notes 3.875% Due July March 15, 2031 | Prior to July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | Notes 3.875% Due July March 15, 2031 | Before July, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 35.00% |  |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.50% Notes, due July 15, 2030 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 5.50% |  |  |  |  |  |  |  |  |  |
Aggregate borrowing amount |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |
Debt issuance costs, gross |  | $ 6,200,000 |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.50% Notes, due July 15, 2030 | Prior to July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |
Senior Notes | 5.50% Notes, due July 15, 2030 | Before July, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  | 35.00% |  |  |  |  |  |  |  |  |  |
Minimum | 5.75% Notes, due July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  |  |  | 35.00% |  |  |  |  |  |  |
Percentage of holders of aggregate outstanding principal amount to declare acceleration of amounts due in any event of default |  |  |  |  | 25.00% |  |  |  |  |  |  |
Minimum | 6.125% Notes, due December 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of holders of aggregate outstanding principal amount to declare acceleration of amounts due in any event of default |  |  |  |  |  |  |  |  |  |  |  | 25.00%
Maximum | 5.00% Notes, due October 1, 2029 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value |  |  |  |  |  | 100.00% |  |  |  |  |  |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  |  |  |  | 35.00% |  |  |  |  |  |
Maximum | 4.00% Notes, due October 1, 2026 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value |  |  |  |  |  |  |  |  |  | 100.00% |  |
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  |  |  |  |  |  |  |  | 35.00% |  |
Maximum | 5.75% Notes, due July 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value |  |  |  |  | 100.00% |  |  |  |  |  |  |
Maximum | 6.125% Notes, due December 15, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt price as percentage of par value |  |  |  |  |  |  |  |  |  |  |  | 100.00%
Percentage of aggregate principal amount of debt that issuer may redeem with cash equal to net proceeds issuer raises in equity offerings at specified redemption prices |  |  |  |  |  |  |  |  |  |  |  | 35.00%
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility |  | $ 600,000,000 |  |  |  |  |  |  | $ 890,000,000 |  |  |
Debt issuance costs |  | $ 3,500,000 |  |  |  |  |  |  |  |  |  |
Maximum total leverage ratio |  |  |  |  |  | 0.060 |  |  |  |  |  |
Aggregate borrowing availability |  |  |  |  |  | $ 575,400,000 |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  |  | $ 24,600,000 |  |  |  |  |  |
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  | 0.75% |  |  |  | 0.75% |  |  |  |  |  |
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  |  |  | 1.75% |  |  |  |  |  |
Revolving Credit Facility | Minimum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  |  |  | 0.75% |  |  |  |  |  |
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  |  |  | 2.75% |  |  |  |  |  |
Revolving Credit Facility | Maximum | Base Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  |  |  | 1.75% |  |  |  |  |  |
Line of Credit | Term Loan Facility, variable rate, due March 3, 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revolving credit facility | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |
Unamortized discount | 1,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs | $ 5,100,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | London Interbank Offered Rate (LIBOR) | Term Loan Facility, variable rate, due March 3, 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate | 2.00% |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Base Rate | Term Loan Facility, variable rate, due March 3, 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate | 1.00% |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Minimum | London Interbank Offered Rate (LIBOR) | Term Loan Facility, variable rate, due March 3, 2028 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate | 0.50% |  |  |  |  |  |  |  |  |  |  |

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