Debt - Schedule of Senior Notes (Details) - Senior Notes - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
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| Debt Instrument [Line Items] | ||
| Face Value | $ 3,400,000 | $ 2,800,000 |
| Fair Value | 3,333,500 | 2,793,500 |
| The 2018 Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Face Value | 0 | 400,000 |
| Fair Value | 0 | 399,500 |
| The 2019 Senior Notes and the 2021 Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Face Value | 900,000 | 900,000 |
| Fair Value | 874,125 | 875,250 |
| The 2025 Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Face Value | 1,500,000 | 1,500,000 |
| Fair Value | 1,475,625 | 1,518,750 |
| The 2026 Senior Notes | ||
| Debt Instrument [Line Items] | ||
| Face Value | 1,000,000 | 0 |
| Fair Value | $ 983,750 | $ 0 |
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- Definition 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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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