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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES , RELATED RISKS AND UNCERTAINTIES - Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022
Restricted Cash and Investments
Cash and cash equivalents	$ 193,636	$ 257,174	$ 159,672	$ 232,131
Restricted cash and cash equivalents	68,500	59,100	53,200	36,900
Total cash, cash equivalents, and restricted cash	262,183	316,238	212,903	269,009
Restricted cash
Restricted Cash and Investments
Restricted cash and cash equivalents	68,547	59,064	53,231	36,246
Other assets, net
Restricted Cash and Investments
Restricted cash and cash equivalents	$ 0	$ 0	$ 0	$ 632

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- Definition

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.

+ References

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-Topic 210
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-Name Accounting Standards Codification
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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.

+ References

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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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