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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, 2016   111,400,000        
Balance (in shares) at Sep. 30, 2016           3,322,000
Balance at Sep. 30, 2016 $ 4,560,925 $ 11,140 $ 448,452 $ 4,289,807 $ (204) $ (188,270)
Comprehensive income (loss):            
Net income (loss) (128,212)     (128,212)    
Other comprehensive income (loss) 2,504       2,504  
Dividends declared (305,909)     (305,909)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)   415,000       88,000
Exercise of employee stock options, net of shares withheld for employee taxes 10,534 $ 42 15,738     $ (5,246)
Tax benefit of stock-based awards 4,414   4,414      
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)   142,000       (57,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes (5,848) $ 14 (7,539)     $ 1,677
Stock-based compensation 26,183   26,183      
Balance (in shares) at Sep. 30, 2017   111,957,000        
Balance (in shares) at Sep. 30, 2017           3,353,000
Balance at Sep. 30, 2017 4,164,591 $ 11,196 487,248 3,855,686 2,300 $ (191,839)
Comprehensive income (loss):            
Net income (loss) 482,672     482,672    
Other comprehensive income (loss) 14,250       14,250  
Dividends declared (310,024)     (310,024)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)   1,000       (202,000)
Exercise of employee stock options, net of shares withheld for employee taxes 3,435   (7,557)     $ 10,992
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)   51,000       (136,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes (4,193) $ 5 (11,857)     $ 7,659
Stock-based compensation $ 31,687   31,687      
Balance (in shares) at Sep. 30, 2018 112,008,961 112,009,000        
Balance (in shares) at Sep. 30, 2018 3,015,243         3,015,000
Balance at Sep. 30, 2018 $ 4,382,735 $ 11,201 500,393 4,027,779 16,550 $ (173,188)
Comprehensive income (loss):            
Net income (loss) (33,656)          
Other comprehensive income (loss) (11,875)       (11,875)  
Dividends declared (313,088)     (313,088)    
Exercise of employee stock options, net of shares withheld for employee taxes (in shares)           (151,000)
Exercise of employee stock options, net of shares withheld for employee taxes 1,321   (7,153)     $ 8,474
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)   71,000       (222,000)
Vesting of restricted stock awards, net of shares withheld for employee taxes (4,689) $ 7 (17,227)     $ 12,531
Stock-based compensation 34,292   34,292      
Share repurchases (in shares)           1,000,000
Share repurchases $ (42,779)         $ (42,779)
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)