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Condensed Consolidated Statements of Shareholders' Equity - USD ($)
shares in Thousands, $ in Thousands
Total
Cumulative Effect, Period of Adoption, Adjustment
Common Stock
Additional Paid-In Capital
Retained Earnings
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Accumulated Other Comprehensive Income (Loss)
Treasury Stock
Balance (in shares) at Sep. 30, 2019     112,080         3,642
Beginning 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 (loss) 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)
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         (258)
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         3,274
Ending balance at Dec. 31, 2019 3,975,537   $ 11,215 499,277 3,666,260   (28,119) $ (173,096)
Balance (in shares) at Sep. 30, 2019     112,080         3,642
Beginning 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 (loss) (435,534)              
Other comprehensive income 1,553              
Balance (in shares) at Jun. 30, 2020     112,151         4,680
Ending balance at Jun. 30, 2020 3,396,057   $ 11,215 514,673 3,096,168   (27,082) $ (198,917)
Balance (in shares) at Sep. 30, 2019     112,080         3,642
Beginning balance at Sep. 30, 2019 4,012,223   $ 11,208 510,305 3,714,307   (28,635) $ (194,962)
Balance (in shares) at Sep. 30, 2020     112,151         4,663
Ending balance at Sep. 30, 2020 $ 3,318,514 $ (1,251) $ 11,215 521,628 3,010,012 $ (1,251) (26,188) $ (198,153)
Increase (Decrease) in Shareholders' Equity                
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member              
Balance (in shares) at Dec. 31, 2019     112,151         3,274
Beginning balance at Dec. 31, 2019 $ 3,975,537   $ 11,215 499,277 3,666,260   (28,119) $ (173,096)
Increase (Decrease) in Shareholders' Equity                
Net income (loss) (420,540)       (420,540)      
Other comprehensive income 516           516  
Dividends declared (76,754)       (76,754)      
Exercise of employee stock options, net of shares withheld for employee taxes 0     (47)       $ 47
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)               (1)
Vesting of restricted stock awards, net of shares withheld for employee taxes 0     (53)       $ 53
Stock-based compensation 10,751     10,751        
Share repurchases (in shares)               1,460
Share repurchases (28,504)             $ (28,504)
Balance (in shares) at Mar. 31, 2020     112,151         4,733
Ending balance at Mar. 31, 2020 3,461,006   $ 11,215 509,928 3,168,966   (27,603) $ (201,500)
Increase (Decrease) in Shareholders' Equity                
Net income (loss) (45,599)       (45,599)      
Other comprehensive income 521           521  
Dividends declared (27,199)       (27,199)      
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)               (53)
Vesting of restricted stock awards, net of shares withheld for employee taxes (296)     (2,879)       $ 2,583
Stock-based compensation 7,624     7,624        
Balance (in shares) at Jun. 30, 2020     112,151         4,680
Ending balance at Jun. 30, 2020 3,396,057   $ 11,215 514,673 3,096,168   (27,082) $ (198,917)
Balance (in shares) at Sep. 30, 2020     112,151         4,663
Beginning balance at Sep. 30, 2020 3,318,514 (1,251) $ 11,215 521,628 3,010,012 (1,251) (26,188) $ (198,153)
Increase (Decrease) in Shareholders' Equity                
Net income (loss) (70,431)       (70,431)      
Other comprehensive income 457           457  
Dividends declared (27,324)       (27,324)      
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)     72         (295)
Vesting of restricted stock awards, net of shares withheld for employee taxes (2,117)   $ 7 (16,742)       $ 14,618
Stock-based compensation 7,451     7,451        
Other (381)     (381)        
Balance (in shares) at Dec. 31, 2020     112,223         4,368
Ending balance at Dec. 31, 2020 3,224,918   $ 11,222 511,956 2,911,006   (25,731) $ (183,535)
Balance (in shares) at Sep. 30, 2020     112,151         4,663
Beginning balance at Sep. 30, 2020 3,318,514 $ (1,251) $ 11,215 521,628 3,010,012 $ (1,251) (26,188) $ (198,153)
Increase (Decrease) in Shareholders' Equity                
Net income (loss) (246,989)              
Other comprehensive income 1,374              
Balance (in shares) at Jun. 30, 2021     112,223         4,324
Ending balance at Jun. 30, 2021 3,007,907   $ 11,222 523,281 2,679,859   (24,814) $ (181,641)
Balance (in shares) at Dec. 31, 2020     112,223         4,368
Beginning balance at Dec. 31, 2020 3,224,918   $ 11,222 511,956 2,911,006   (25,731) $ (183,535)
Increase (Decrease) in Shareholders' Equity                
Net income (loss) (121,003)       (121,003)      
Other comprehensive income 457           457  
Dividends declared (27,268)       (27,268)      
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)               (39)
Vesting of restricted stock awards, net of shares withheld for employee taxes 0     (1,678)       $ 1,678
Stock-based compensation 6,826     6,826        
Other (234)     (234)        
Balance (in shares) at Mar. 31, 2021     112,223         4,329
Ending balance at Mar. 31, 2021 3,083,696   $ 11,222 516,870 2,762,735   (25,274) $ (181,857)
Increase (Decrease) in Shareholders' Equity                
Net income (loss) (55,555)       (55,555)      
Other comprehensive income 460           460  
Dividends declared (27,321)       (27,321)      
Vesting of restricted stock awards, net of shares withheld for employee taxes (in shares)               (5)
Vesting of restricted stock awards, net of shares withheld for employee taxes (41)     (257)       $ 216
Stock-based compensation 6,963     6,963        
Other (295)     (295)        
Balance (in shares) at Jun. 30, 2021     112,223         4,324
Ending balance at Jun. 30, 2021 $ 3,007,907   $ 11,222 $ 523,281 $ 2,679,859   $ (24,814) $ (181,641)