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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES, RISKS AND UNCERTAINTIES - Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 370,553	$ 487,884	$ 426,245	$ 347,943
Restricted cash	51,300	48,900	50,000	35,000
Total cash, cash equivalents, and restricted cash	421,872	536,747	476,224	382,971
Prepaid expenses and other, net
Summary of Significant Accounting Policies [Line Items]
Restricted cash	48,434	45,577	46,643	31,291
Other assets, net
Summary of Significant Accounting Policies [Line Items]
Restricted cash	$ 2,885	$ 3,286	$ 3,336	$ 3,737

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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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