Quarterly report [Sections 13 or 15(d)]

DISTRIBUTIONS TO COMMON STOCKHOLDERS - Dividends Declared (Details)

v3.25.1
DISTRIBUTIONS TO COMMON STOCKHOLDERS - Dividends Declared (Details) - $ / shares
 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Class of Stock [Line Items]    
Common stock dividends paid (in USD per share) $ 1.39 $ 0.99
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, ordinary (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  
O 2024 M1 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2024 M2 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2024 M3 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2024 M4 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2024 M5 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2024 M6 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   $ 0.165