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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES , RELATED RISKS AND UNCERTAINTIES - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Restricted Cash and Investments
Cash and cash equivalents	$ 391,179	$ 217,341	$ 214,104	$ 257,174
Restricted cash and cash equivalents	1,300,000	1,300,000	65,100	59,100
Total cash, cash equivalents, and restricted cash	1,706,519	1,528,660	279,241	316,238
Restricted cash
Restricted Cash and Investments
Restricted cash and cash equivalents	73,216	68,902	65,137	59,064
Other assets, net
Restricted Cash and Investments
Restricted cash and cash equivalents	$ 1,242,124	$ 1,242,417	$ 0	$ 0

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. 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. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash and cash equivalents 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. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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