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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
$ in Thousands
Total
Common Stock
Additional Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance (in shares) at Sep. 30, 2018   112,009,000        
Balance (in shares) at Sep. 30, 2018           3,015,000
Balance at Sep. 30, 2018 $ 4,382,735 $ 11,201 $ 500,393 $ 4,027,779 $ 16,550 $ (173,188)
Increase (Decrease) in Shareholders' Equity            
Net income 18,959     18,959    
Other comprehensive income 225       225  
Dividends declared (78,488)     (78,488)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)           (125,000)
Exercise of employee stock options, net of shares withheld for employee taxes 224   (6,756)     $ 6,980
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)   71,000       (215,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes (4,537) $ 7 (16,673)     $ 12,129
Stock-based compensation 7,158   7,158      
Balance (in shares) at Dec. 31, 2018   112,080,000        
Balance (in shares) at Dec. 31, 2018           2,675,000
Balance at Dec. 31, 2018 $ 4,326,238 $ 11,208 484,122 3,997,283 (12,296) $ (154,079)
Balance (in shares) at Sep. 30, 2019 112,080,262 112,080,000        
Balance (in shares) at Sep. 30, 2019 3,642,358         3,642,000
Balance at Sep. 30, 2019 $ 4,012,223 $ 11,208 510,305 3,714,307 (28,635) $ (194,962)
Increase (Decrease) in Shareholders' Equity            
Net income 30,605     30,605    
Other comprehensive income 516       516  
Dividends declared (78,652)     (78,652)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)           (110,000)
Exercise of employee stock options, net of shares withheld for employee taxes 4,045   (3,103)     $ 7,148
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)   71,000       (258,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes (3,401) $ 7 (18,126)     $ 14,718
Stock-based compensation $ 10,201   10,201      
Balance (in shares) at Dec. 31, 2019 112,151,563 112,151,000        
Balance (in shares) at Dec. 31, 2019 3,274,354         3,274,000
Balance at Dec. 31, 2019 $ 3,975,537 $ 11,215 $ 499,277 $ 3,666,260 $ (28,119) $ (173,096)