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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, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract]                      
Operating revenues $ 649,050 $ 687,974 $ 720,868 $ 740,598 $ 696,825 $ 648,872 $ 577,484 $ 564,087 $ 2,798,490 $ 2,487,268 $ 1,804,741
Operating income (loss) 39,021 (167,874) 95,146 54,289 24,213 6,306 (1,164) 3,609 20,582 32,964 (169,087)
Income (loss) from continuing operations 41,890 (154,621) 71,857 8,364 2,175 (8,174) (1,633) 500,642 (32,510) 493,010 (127,863)
Net income (loss) $ 41,177 $ (154,683) $ 60,891 $ 18,959 $ 2,453 $ (8,008) $ (11,879) $ 500,106 $ (33,656) $ 482,672 $ (128,212)
Basic earnings (loss) per common share:                      
Income (loss) from continuing operations (in dollars per share) $ 0.38 $ (1.42) $ 0.65 $ 0.07 $ 0.02 $ (0.08) $ (0.03) $ 4.57 $ (0.33) $ 4.49 $ (1.20)
Net income (loss) (in dollars per share) 0.37 (1.42) 0.55 0.17 0.02 (0.08) (0.12) 4.57 (0.34) 4.39 (1.20)
Diluted earnings (loss) per common share:                      
Income (loss) from continuing operations (in dollars per share) 0.38 (1.42) 0.65 0.07 0.02 (0.08) (0.03) 4.55 (0.33) 4.47 (1.20)
Net income (in dollars per share) $ 0.37 $ (1.42) $ 0.55 $ 0.17 $ 0.02 $ (0.08) $ (0.12) $ 4.55 $ (0.34) $ 4.37 $ (1.20)