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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]        
Net income $ 172,971 $ 45,469 $ 180,664 $ 105,675
Basic earnings per share        
Weighted average shares of common stock outstanding-basic (in shares) 42,079,000 41,789,000 42,050,000 41,742,000
Basic earnings per common share (usd per share) $ 4.11 $ 1.09 $ 4.30 $ 2.53
Diluted earnings per share        
Incremental shares 378,000 [1] 183,000 [1] 378,000 [1] 183,000 [1]
Weighted average shares of common stock outstanding-diluted (in shares) 42,457,000 41,972,000 42,428,000 41,925,000
Diluted earnings (loss) per common share (usd per share) $ 4.07 [2] $ 1.08 [2] $ 4.26 [2] $ 2.52 [2]
Anti-dilutive shares excluded from the calculation of diluted earnings per share (in shares) 0 0 0 0
[1] Incremental shares consist of stock options, stock awards and performance units.
[2] There were no anti-dilutive shares excluded from the calculation of diluted earnings per share for the three and six months ended March 31, 2014 and 2013.