Quarterly report [Sections 13 or 15(d)]

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Schedule of Dividends Declared (Details)

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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Schedule of Dividends Declared (Details) - $ / shares
 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Class of Stock [Line Items]    
Common stock dividends paid (in USD per share) $ 0.900 $ 1.390
O 2026 M1 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) 0.15  
O 2026 M2 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) 0.15  
O 2026 M3 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) 0.15  
O 2026 M4 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) 0.15  
O 2026 M5 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) 0.15  
O 2026 M6 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) $ 0.15  
O 2025 M1 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2025 M2 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2025 M3 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
Common stock, dividends, paid, supplemental (in USD per share)   0.400
O 2025 M4 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2025 M5 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, supplemental (in USD per share)   0.165
O 2025 M6 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   $ 0.165