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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES AND RELATED RISKS AND UNCERTAINTIES - Restricted Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Restricted Cash and Investments        
Cash and cash equivalents $ 220,609 $ 232,131 $ 188,663 $ 917,534
Restricted cash and cash equivalents 61,400 36,900 33,900 19,200
Total cash, cash equivalents, and restricted cash 281,973 269,009 222,589 936,716
Restricted cash        
Restricted Cash and Investments        
Restricted cash and cash equivalents 61,364 36,246 33,242 18,350
Other assets, net        
Restricted Cash and Investments        
Restricted cash and cash equivalents $ 0 $ 632 $ 684 $ 832