Summary of Significant Accounting Policies - Schedule of Restrictions on Cash and Cash Equivalents (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Sep. 30, 2025 |
Jun. 30, 2025 |
Sep. 30, 2024 |
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| Restricted Cash and Cash Equivalent Item [Line Items] | ||||
| Cash and cash equivalents | $ 2,815,291 | $ 4,356,138 | $ 2,231,852 | $ 3,132,648 |
| Cash, cash equivalents, and restricted cash | 2,864,957 | 4,394,549 | 2,275,326 | 3,297,880 |
| Balance Sheet Location [Axis]: us-gaap:AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent | ||||
| Restricted Cash and Cash Equivalent Item [Line Items] | ||||
| Restricted cash | 49,666 | 38,411 | 43,474 | 98,596 |
| Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | ||||
| Restricted Cash and Cash Equivalent Item [Line Items] | ||||
| Restricted cash | $ 0 | $ 0 | $ 0 | $ 66,636 |
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- Definition Amount of cash and cash equivalent. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cash and cash equivalent, and cash and cash equivalent restricted to withdrawal or usage; attributable to continuing operation. Cash includes, but is not limited to, currency on hand, demand deposit with financial institution, and account with general characteristic of demand deposit. Cash equivalent includes, but is not limited to, short-term, highly liquid investment that is both readily convertible to known amount of cash and so near maturity that it presents insignificant risk of change in value because of change in interest rate. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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/2009/role/commonPracticeRef
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