Quarterly report [Sections 13 or 15(d)]

REGISTRATION STATEMENT AND COMMON EQUITY OFFERINGS (Details)

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REGISTRATION STATEMENT AND COMMON EQUITY OFFERINGS (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Aug. 31, 2024
Government Assistance [Line Items]          
Sale of stock, aggregate value of securities authorized $ 700,000,000.0   $ 700,000,000.0    
Sale of stock, remaining capacity of aggregate value of securities authorized $ 430,600,000   $ 430,600,000    
Common Stock At-the-Market Offerings          
Government Assistance [Line Items]          
Sale of stock, aggregate offering price authorized         $ 150,000,000.0
Sale of stock, number of shares issued in transaction (in shares) 0 0 0 99,265  
Sale of stock, price (in USD per share)   $ 24.90   $ 24.90  
Sale of stock, gross proceeds from transaction   $ 2,500,000   $ 2,500,000  
Sale of stock, consideration received on transaction   $ 2,400,000   $ 2,400,000  
Sale of stock, remaining capacity of authorized offering price $ 129,400,000   $ 129,400,000