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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Earnings Per Share [Abstract]        
Net income $ 45,469 $ 54,535 $ 105,675 $ 111,892
Basic earnings per share        
Weighted average shares of common stock outstanding-basic (in shares) 41,789 41,509 41,742 41,472
Basic (loss) earnings per common share (usd per share) $ 1.09 $ 1.31 $ 2.53 $ 2.70
Diluted earnings per share        
Incremental shares 183 [1] 202 [1] 183 [1] 201 [1]
Weighted average shares of common stock outstanding-diluted (in shares) 41,972 41,711 41,925 41,673
Diluted (loss) earnings per common share (usd per share) $ 1.08 [2] $ 1.31 [2] $ 2.52 [2] $ 2.68 [2]
[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, 2013 and 2012.