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OTHER BORROWINGS, Credit Facility (Details) - Revolving Credit Facility - The Credit Facility - Secured and unsecured lines of credit - USD ($)
9 Months Ended
Jun. 30, 2026
Sep. 30, 2025
Debt Instrument [Line Items]    
Revolving credit agreement maximum borrowing capacity $ 1,000,000,000  
Revolving credit agreement, borrowings outstanding $ 0 $ 0
Revolving credit agreement, facility fee percentage 0.125%