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Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Supplemental disclosure of non-cash activity:        
Increase in operating lease right-of-use assets $ 1,493 $ 4,114    
Increase in operating lease liabilities 1,493 4,114    
Supplemental disclosure of cash activity:        
Interest payments 67,645 60,715    
Income tax payments 9,930 10,321    
Reconciliation of cash, cash equivalents, and restricted cash:        
Cash and cash equivalents 82,932 73,212 $ 203,907  
Restricted cash 7,490 35,224 38,703  
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows $ 90,422 $ 108,436 $ 242,610 $ 386,289