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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share [Abstract]        
Net income, as reported $ 114,702 $ 73,353 $ 149,631 $ 123,635
Basic earnings per share        
Weighted average shares of common stock outstanding-basic (shares) 86,275,000 85,834,000 86,182,000 85,754,000
Basic earnings per common share (usd per share) $ 1.33 $ 0.85 $ 1.74 $ 1.44
Diluted earnings per share        
Weighted average shares of common stock outstanding-basic (shares) 86,275,000 85,834,000 86,182,000 85,754,000
Incremental shares 826,000 1,024,000 811,000 1,024,000
Weighted average shares of common stock outstanding-diluted (shares) 87,101,000 86,858,000 86,993,000 86,778,000
Diluted (loss) earnings per common share (usd per share) $ 1.32 $ 0.84 $ 1.72 $ 1.42
Anti-dilutive shares excluded from the calculation of diluted earnings per share 0 0 0 0