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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2014
Earnings Per Share [Abstract]                      
Net income, as reported $ 25,400 $ (17,363) $ 73,354 $ 50,281 $ 4,197 $ (7,460) $ 60,903 $ 123,320 $ 131,672 $ 180,960 $ 141,970
Basic earnings per share                      
Weighted average shares of common stock outstanding-basic (in shares)                 85,884,000 85,186,000 84,198,000
Basic earnings per common share (in dollars per share) $ 0.30 $ (0.20) $ 0.85 $ 0.59 $ 0.05 $ (0.09) $ 0.71 $ 1.46 $ 1.53 $ 2.12 $ 1.69
Diluted earnings per share                      
Weighted average shares of common stock outstanding-basic (in shares)                 85,884,000 85,186,000 84,198,000
Incremental shares (in shares) [1]                 847,000 1,079,000 724,000
Weighted average shares of common stock outstanding-diluted (in shares)                 86,731,000 86,265,000 84,922,000
Diluted earnings per common share (in dollars per share) $ 0.29 $ (0.20) $ 0.84 $ 0.58 $ 0.05 $ (0.09) $ 0.71 $ 1.44 $ 1.52 [2] $ 2.10 [2] $ 1.67 [2]
Anti-dilutive securities excluded from the calculation of diluted earnings per share (in shares)                 0 0 0
[1] Incremental shares consist primarily of unvested stock awards and performance units.
[2] There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for fiscal 2016, 2015 and 2014.