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Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Preferred Stock
Common Stock
Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Beginning balance at Sep. 30, 2021 $ 2,126,064 $ 300,000 $ 135,993 $ 1,678,622 $ 1,528,611 $ 69,785 $ (1,586,947)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 236,330       236,330    
Other comprehensive income (loss) (17,304)         (17,304)  
Dividends on common stock (61,576)       (61,576)    
Dividends on preferred stock (14,625)       (14,625)    
Proceeds from stock issuances 1,823   65 1,758      
Stock-based compensation expense 6,808   213 6,595      
Treasury stock purchased (3,260)           (3,260)
Ending balance at Sep. 30, 2022 2,274,260 300,000 136,271 1,686,975 1,688,740 52,481 (1,590,207)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 257,426       257,426    
Other comprehensive income (loss) (5,560)         (5,560)  
Dividends on common stock (63,792)       (63,792)    
Dividends on preferred stock (14,625)       (14,625)    
Proceeds from stock issuances 1,266   42 1,224      
Stock-based compensation expense (411)   154 (565)      
Repurchase of stock warrants 8,325           8,325
Treasury stock purchased (30,463)           (30,463)
Ending balance at Sep. 30, 2023 2,426,426 300,000 136,467 1,687,634 1,867,749 46,921 (1,612,345)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Net income 200,041       200,041    
Other comprehensive income (loss) 8,930         8,930  
Dividends on common stock (74,267)       (74,267)    
Dividends on preferred stock (14,625)       (14,625)    
Stock issued in merger 465,504   17,089 448,415      
Proceeds from stock issuances 6,179   231 5,948      
Stock-based compensation expense 9,181   220 8,678     283
Treasury stock purchased (27,069)           (27,069)
Ending balance at Sep. 30, 2024 $ 3,000,300 $ 300,000 $ 154,007 $ 2,150,675 $ 1,978,898 $ 55,851 $ (1,639,131)