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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, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]        
Net income, as reported $ 60,903us-gaap_NetIncomeLoss $ 172,971us-gaap_NetIncomeLoss $ 184,223us-gaap_NetIncomeLoss $ 180,664us-gaap_NetIncomeLoss
Basic earnings per share        
Weighted average shares of common stock outstanding-basic (in shares) 85,328,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 84,158,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 84,940,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 84,100,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per common share (usd per share) $ 0.71us-gaap_EarningsPerShareBasic $ 2.06us-gaap_EarningsPerShareBasic $ 2.17us-gaap_EarningsPerShareBasic $ 2.15us-gaap_EarningsPerShareBasic
Diluted earnings per share        
Incremental shares 1,042,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [1] 756,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [1] 1,042,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [1] 756,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment [1]
Weighted average shares of common stock outstanding-diluted (in shares) 86,370,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 84,914,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 85,982,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 84,856,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per common share (usd per share) $ 0.71us-gaap_EarningsPerShareDiluted [2] $ 2.04us-gaap_EarningsPerShareDiluted [2] $ 2.14us-gaap_EarningsPerShareDiluted [2] $ 2.13us-gaap_EarningsPerShareDiluted [2]
Anti-dilutive shares excluded from the calculation of diluted earnings per share 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
[1] Incremental shares consist primarily of stock awards and performance shares.
[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, 2015, and 2014.