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SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) - Summary of Selected Quarterly Financial Data (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 208,267 $ 317,364 $ 633,639 $ 614,657 $ 649,050 $ 687,974 $ 720,868 $ 740,598 $ 1,773,927 $ 2,798,490 $ 2,487,268
Operating income (loss) (75,430) (57,584) (518,541) 31,368 39,021 (167,874) 95,146 54,289 (620,187) 20,582 32,964
Income (loss) from continuing operations (60,646) (46,007) (420,468) 30,729 41,890 (154,621) 71,857 8,364 (496,392) (32,510) 493,010
Net income (loss) $ (58,963) $ (45,599) $ (420,540) $ 30,605 $ 41,177 $ (154,683) $ 60,891 $ 18,959 $ (494,497) $ (33,656) $ 482,672
Basic earnings (loss) per common share:                      
Income (loss) from continuing operations (in dollars per share) $ (0.57) $ (0.43) $ (3.88) $ 0.27 $ 0.38 $ (1.42) $ 0.65 $ 0.07 $ (4.62) $ (0.33) $ 4.49
Net income (loss) (in dollars per share) (0.55) (0.43) (3.88) 0.27 0.37 (1.42) 0.55 0.17 (4.60) (0.34) 4.39
Diluted earnings (loss) per common share:                      
Income (loss) from continuing operations (in dollars per share) (0.57) (0.43) (3.88) 0.27 0.38 (1.42) 0.65 0.07 (4.62) (0.33) 4.47
Net income (in dollars per share) $ (0.55) $ (0.43) $ (3.88) $ 0.27 $ 0.37 $ (1.42) $ 0.55 $ 0.17 $ (4.60) $ (0.34) $ 4.37
Included within net income (loss):                      
Gain from the sale of assets, after tax $ 21,674 $ 3,254 $ 7,985 $ 3,314 $ 9,752 $ 7,718 $ 8,886 $ 4,268      
Asset impairment charges, after tax 0 0 (436,225) 0 $ 0 $ (173,227) $ 0 $ 0      
Restructuring charges, after tax $ (428) $ (12,001) $ 0 $ 0              
Effect on diluted earnings per common share:                      
Gain from the sale of assets after tax per diluted share (in dollars per share) $ 0.2 $ 0.03 $ 0.07 $ 0.03 $ 0.09 $ 0.07 $ 0.08 $ 0.04      
Asset impairment charges after tax per diluted share (in dollars per share) 0 0 (4.02) 0 $ 0 $ (1.58) $ 0 $ 0      
Restructuring charges after tax per diluted share (in dollars per share) $ 0 $ (0.11) $ 0 $ 0