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Equities - Schedule of Dividends Declared Per Share for Preferred Stock (Details) - $ / shares
 3 Months Ended 9 Months Ended
May 31, 2026
May 31, 2025
May 31, 2026
May 31, 2025
8% Cumulative Redeemable        
Class of Stock [Line Items]        
Preferred stock dividend rate     8.00%  
Preferred stock dividends declared (in dollars per share) $ 0.50 $ 0.50 $ 2.00 $ 2.00
Class B Cumulative Redeemable, Series 1        
Class of Stock [Line Items]        
Preferred stock dividends declared (in dollars per share) 0.49 0.49 1.97 1.97
Class B Reset Rate Cumulative Redeemable, Series 2        
Class of Stock [Line Items]        
Preferred stock dividends declared (in dollars per share) 0.44 0.44 1.78 1.78
Class B Reset Rate Cumulative Redeemable, Series 3        
Class of Stock [Line Items]        
Preferred stock dividends declared (in dollars per share) 0.42 0.42 1.69 1.69
Class B Cumulative Redeemable, Series 4        
Class of Stock [Line Items]        
Preferred stock dividends declared (in dollars per share) $ 0.47 $ 0.47 $ 1.88 $ 1.88