Quarterly report [Sections 13 or 15(d)]

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

v3.25.2
DISTRIBUTIONS TO COMMON STOCKHOLDERS - Schedule of Dividends Declared (Details) - $ / shares
 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Class of Stock [Line Items]    
Common stock dividends paid (in USD per share) $ 1.89 $ 1.49
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 2025 M7 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) 0.165  
O 2025 M8 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share) 0.165  
O 2025 M9 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
O 2024 M7 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2024 M8 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   0.165
O 2024 M9 Dividends    
Class of Stock [Line Items]    
Common stock, dividends, paid, ordinary (in USD per share)   $ 0.165