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DEBT - Senior Notes (Details) | Jun. 17, 2024 | May 23, 2024 USD ($) day $ / shares | May 20, 2024 USD ($) | Mar. 03, 2021 USD ($) | Jun. 30, 2020 USD ($) | Sep. 24, 2019 USD ($) | Sep. 20, 2016 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 | Sep. 20, 2016 EUR (€)
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Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Amount |  | $ 50,000,000 | $ 50,000,000 |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.667% |  |  |  |  |  |  |  |  |
3.375% Exchangeable Notes, due June 1, 2029 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.375% |  |  |  |  |  | 3.375% |  |
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.375% |  |  |  |  |  |  |  |
Aggregate borrowing amount |  | $ 350,000,000 |  |  |  |  |  |  |  |
Payments for premium on equity component of convertible debt |  | $ 25,200,000 |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |  |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 30 |  |  |  |  |  |  |  |
Convertible, conversion price (in dollars per share) | $ / shares |  | $ 121.86 |  |  |  |  |  |  |  |
Scheduled trading day | day |  | 41 |  |  |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 11,800,000 |  |  |  |  |  | $ 11,100,000 |  |
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt | Debt Instrument, Conversion Terms, Scenario One |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 130.00% |  |  |  |  |  |  |  |
Threshold trading days | day |  | 20 |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 30 |  |  |  |  |  |  |  |
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt | Debt Instrument, Conversion Terms, Scenario Two |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger |  | 98.00% |  |  |  |  |  |  |  |
Threshold trading days | day |  | 5 |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 10 |  |  |  |  |  |  |  |
3.375% Exchangeable Notes, due June 1, 2029 | Convertible Debt | Debt Instrument, Conversion Terms, Scenario Three |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days | day |  | 10 |  |  |  |  |  |  |  |
3.375% Exchangeable Notes, due June 1, 2029 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion ratio |  | 0.008206 |  |  |  |  |  |  |  |
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
Capitalized debt issuance costs |  |  |  |  |  |  | $ 7,700,000 |  |  |
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 |  |  |  |
Unamortized debt issuance costs |  |  |  |  |  |  |  | $ 100,000 |  |
Capitalized debt issuance costs |  |  |  |  |  | $ 4,100,000 |  |  |  |
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default |  |  |  |  |  | 25.00% |  |  |  |
5.50% Notes, due July 15, 2030 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 5.50% | 5.50% |
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default |  |  |  |  | 25.00% |  |  |  |  |
5.50% Notes, due July 15, 2030 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.50% |  |  |  |  |
Aggregate borrowing amount |  |  |  |  | $ 300,000,000 |  |  |  |  |
Unamortized debt issuance costs |  |  |  |  | $ 6,200,000 |  |  | $ 200,000 |  |
5.50% Notes, due July 15, 2030 | Senior Notes | Prior to July 15, 2025 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  |  | 100.00% |  |  |  |  |
5.50% Notes, due July 15, 2030 | Senior Notes | Before July, 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price, percentage of principal amount redeemed |  |  |  |  | 35.00% |  |  |  |  |
3.875% Notes, due March 15, 2031 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 3.875% | 3.90% |
Minimum percentage of aggregate outstanding principal amount to declare acceleration of debt in case of default |  |  |  | 25.00% |  |  |  |  |  |
3.875% Notes, due March 15, 2031 | Senior Notes |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  | 3.875% |  |  |  |  |  |
Aggregate borrowing amount |  |  |  | $ 500,000,000 |  |  |  |  |  |
Unamortized debt issuance costs |  |  |  | $ 7,600,000 |  |  |  | $ 1,300,000 |  |
3.875% Notes, due March 15, 2031 | Senior Notes | Prior to July 15, 2025 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |  |  |  |
3.875% Notes, due March 15, 2031 | Senior Notes | Before July, 2023 |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 35.00% |  |  |  |  |  |

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