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DEBT - Narrative (Details) $ / shares in Units, shares in Millions |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2024 | May 23, 2024 USD ($) day $ / shares shares | May 20, 2024 USD ($) | Oct. 19, 2023 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Jul. 02, 2023 USD ($) | Jun. 30, 2024 USD ($) | Jul. 02, 2023 USD ($) | Jun. 03, 2024 USD ($) | Sep. 30, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.30% |  |  | 5.30% |  |  | 5.30%
Treasury stock repurchases |  | $ 50,000,000 | $ 50,000,000 |  | $ 142,200,000 | $ 97,600,000 | $ 500,000,000.0 |  |  |  |
Premium on capped call transactions |  |  |  |  |  |  |  | $ 25,200,000 | $ 0 |  |
Amounts Paid |  |  |  |  | $ 1,166,500,000 |  |  | $ 1,166,500,000 |  |  |
3.375 % Exchangeable Notes, Due June 1, 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.375% |  |  | 3.375% |  |  |
5.00% Notes, due October 1, 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.00% |  |  | 5.00% |  |  | 5.00%
Amounts Paid |  |  |  |  | $ 284,200,000 |  |  | $ 284,200,000 |  |  |
5.50% Notes, due July 15, 2030 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.50% |  |  | 5.50% |  |  | 5.50%
Amounts Paid |  |  |  |  | $ 142,500,000 |  |  | $ 142,500,000 |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage | 100.667% |  |  |  |  |  |  |  |  |  |
Amounts Paid |  |  | $ 925,000,000 |  |  |  |  |  |  | $ 1,160,500,000 |
Convertible Debt | 3.375 % Exchangeable Notes, Due June 1, 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  | 11,800,000 |  |  |  |  |  |  |  |  |
Amounts Tendered |  | $ 350,000,000 |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.375% |  |  |  |  |  |  |  |  |
Premium on capped call transactions |  | $ 25,200,000 |  |  |  |  |  |  |  |  |
Debt instrument, convertible threshold percentage |  | 130.00% |  |  |  |  |  |  |  |  |
Debt instrument, trading days | day |  | 20 |  |  |  |  |  |  |  |  |
Debt instrument, consecutive trading days | day |  | 30 |  |  |  |  |  |  |  |  |
Debt instrument, conversion price (in dollars per share) | $ / shares |  | $ 121.86 |  |  |  |  |  |  |  |  |
Debt instrument, convertible, scheduled trading day | day |  | 41 |  |  |  |  |  |  |  |  |
Redemption price percentage |  | 100.00% |  |  |  |  |  |  |  |  |
Convertible Debt | 3.375 % Exchangeable Notes, Due June 1, 2029 | Debt Instrument, Conversion Terms, Scenario One |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible threshold percentage |  | 130.00% |  |  |  |  |  |  |  |  |
Debt instrument, trading days | day |  | 20 |  |  |  |  |  |  |  |  |
Debt instrument, consecutive trading days | day |  | 30 |  |  |  |  |  |  |  |  |
Convertible Debt | 3.375 % Exchangeable Notes, Due June 1, 2029 | Debt Instrument, Conversion Terms, Scenario Two |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, convertible threshold percentage |  | 98.00% |  |  |  |  |  |  |  |  |
Debt instrument, trading days | day |  | 5 |  |  |  |  |  |  |  |  |
Debt instrument, consecutive trading days | day |  | 10 |  |  |  |  |  |  |  |  |
Convertible Debt | 3.375 % Exchangeable Notes, Due June 1, 2029 | Debt Instrument, Conversion Terms, Scenario Three |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, consecutive trading days | day |  | 10 |  |  |  |  |  |  |  |  |
Convertible Debt | Capped Call Transactions |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion price (in dollars per share) | $ / shares |  | $ 121.86 |  |  |  |  |  |  |  |  |
Debt instrument, convertible stock trigger price (in dollars per share) | $ / shares |  | $ 159.36 |  |  |  |  |  |  |  |  |
Debt instrument common stock shares | shares |  | 0.7 |  |  |  |  |  |  |  |  |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  |  | 180,100,000 |  |  |
Gain from debt repurchase |  |  |  |  |  |  |  | 4,700,000 |  |  |
Payment of debt issuance costs |  |  |  |  |  |  |  | $ 2,500,000 |  |  |
Senior Notes | 3.375 % Exchangeable Notes, Due June 1, 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument conversion ratio |  | 0.008206 |  |  |  |  |  |  |  |  |
Senior Notes | 4.00% Senior Noted Due 2026 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 4.00% |  |  |  |  |  |  |  |
Senior Notes | 5.00 % Senior Noted Due 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.00% |  |  |  |  |  |  |  |
Senior Notes | 5.50% Senior Notes Due 2030 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 5.50% |  |  |  |  |  |  |  |
Senior Notes | 3.875% Senior Notes Due 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.875% |  |  |  |  |  |  |  |
Senior Notes | 5.00% Notes, due October 1, 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.00% |  |  | 5.00% |  |  |
Extinguishment of debt |  |  |  |  |  |  |  | $ 8,100,000 |  |  |
Senior Notes | 5.50% Notes, due July 15, 2030 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 5.50% |  |  | 5.50% |  |  |
Extinguishment of debt |  |  |  |  |  |  |  | $ 132,800,000 |  |  |
Senior Notes | Notes 3.875% Due March 15, 2031 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.875% |  |  | 3.875% |  |  |
Extinguishment of debt |  |  |  |  |  |  |  | $ 39,200,000 |  |  |
Revolving Credit Facility | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 500,000,000 |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  |  |  | 0.20% |  |  |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage, maximum |  |  |  | 0.40% |  |  |  |  |  |  |
Offering fees |  |  |  |  |  |  |  | 4,000,000.0 |  |  |
Debt issuance costs |  |  |  |  | $ 3,200,000 |  |  | 3,200,000 |  |  |
Remaining borrowing capacity |  |  |  |  | 490,400,000 |  |  | 490,400,000 |  |  |
Revolving Credit Facility | Line of Credit | Minimum | SOFR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum | Alternate Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 0.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum | EURIBOR Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum | CORRA Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum | Canadian Prime Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 0.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Minimum | SONIA Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum | SOFR |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 2.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum | Alternate Base Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum | EURIBOR Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 2.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum | CORRA Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 2.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum | Canadian Prime Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Maximum | SONIA Rate |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage over base variable rate |  |  |  | 2.00% |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | U.S. Plans |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 400,000,000 |  |  |  |  |  |  |
Revolving Credit Facility | Line of Credit | Non-US |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 100,000,000 |  |  |  |  |  |  |
Letter of Credit | Line of Credit |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 9,600,000 |  |  | $ 9,600,000 |  |  |

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