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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance, beginning of period at Sep. 30, 2017 $ 2,005,688 $ 134,958 $ 1,660,885 $ 1,042,890 $ 5,015 $ (838,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 152,335     152,335    
Other comprehensive income (loss) 3,122          
Other comprehensive income (loss) 1,350       1,350  
Dividends on common stock ($0.49 per share) (41,091)     (41,091)    
Proceeds from stock-based awards 1,288 60 1,228      
Stock-based compensation expense 3,634 215 3,419      
Exercise of stock warrants 0 111 (111)      
Treasury stock acquired (136,941)         (136,941)
Balance, end of period at Jun. 30, 2018 1,986,263 135,344 1,665,421 1,152,362 8,137 (975,001)
Balance, beginning of period at Mar. 31, 2018 1,988,673 135,334 1,664,275 1,115,204 8,899 (935,039)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 51,394     51,394    
Other comprehensive income (loss) (761)          
Other comprehensive income (loss) (762)       (762)  
Dividends on common stock ($0.49 per share) (14,236)     (14,236)    
Proceeds from stock-based awards 56 4 52      
Stock-based compensation expense 1,100 4 1,096      
Exercise of stock warrants 0 2 (2)      
Treasury stock acquired (39,962)         (39,962)
Balance, end of period at Jun. 30, 2018 1,986,263 135,344 1,665,421 1,152,362 8,137 (975,001)
Balance, beginning of period at Sep. 30, 2018 1,996,908 135,343 1,666,609 1,188,971 8,294 (1,002,309)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 157,894     157,894    
Other comprehensive income (loss) 3,843       3,843  
Dividends on common stock ($0.49 per share) (46,749)     (46,749)    
Proceeds from stock-based awards 712 37 675      
Stock-based compensation expense 4,061 108 3,953      
Exercise of stock warrants 0 39 (39)      
Treasury stock acquired (103,935)         (103,935)
Balance, end of period at Jun. 30, 2019 2,012,734 135,527 1,671,198 1,300,116 12,137 (1,106,244)
Balance, beginning of period at Mar. 31, 2019 2,004,280 135,507 1,669,860 1,262,236 8,634 (1,071,957)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 53,854     53,854    
Other comprehensive income (loss) 3,503       3,503  
Dividends on common stock ($0.49 per share) (15,974)     (15,974)    
Proceeds from stock-based awards 159 13 146      
Stock-based compensation expense 1,199 7 1,192      
Treasury stock acquired (34,287)         (34,287)
Balance, end of period at Jun. 30, 2019 $ 2,012,734 $ 135,527 $ 1,671,198 $ 1,300,116 $ 12,137 $ (1,106,244)