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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share [Abstract]                      
Net income, as reported $ (16,255) $ (14,274) $ 140,266 $ 123,699 $ (36,523) $ 18,957 $ 114,702 $ 34,929 $ 233,436 $ 132,065 $ 131,672
Basic earnings per share                      
Weighted average shares of common stock outstanding-basic (in shares)                 87,689,000 86,321,000 85,884,000
Basic earnings per common share (in dollars per share) $ (0.18) [1] $ (0.16) [1] $ 1.60 [1] $ 1.42 [1] $ (0.42) [1] $ 0.22 [1] $ 1.33 [1] $ 0.41 [1] $ 2.66 $ 1.53 $ 1.53
Diluted earnings per share                      
Weighted average shares of common stock outstanding-basic (in shares)                 87,689,000 86,321,000 85,884,000
Incremental shares (in shares) [2]                 626,000 823,000 847,000
Weighted average shares of common stock outstanding-diluted (in shares)                 88,315,000 87,144,000 86,731,000
Diluted earnings per common share (in dollars per share) $ (0.18) [1] $ (0.16) [1] $ 1.59 [1] $ 1.42 [1] $ (0.42) [1] $ 0.22 [1] $ 1.32 [1] $ 0.40 [1] $ 2.64 [3] $ 1.52 [3] $ 1.52 [3]
Anti-dilutive securities excluded from the calculation of diluted earnings per share (in shares)                 0 0 0
[1] The sum of quarterly amounts may not equal the annual amounts due to rounding.
[2] Incremental shares consist primarily of unvested stock awards and performance units.
[3] There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for fiscal 2018, 2017 and 2016.