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DEBT (Details) (USD $)
12 Months Ended
Sep. 30, 2011
LetterOfCredit
Trust
Sep. 30, 2010
Debt  
Debt Instrument, Gross$ 350,000,000$ 360,000,000
Long-term debt due within one year115,000,000 
Long-term debt235,000,000360,000,000
Maximum | Unsecured intermediate debt issued August 15, 2002
  
Debt  
Ratio of debt to total capitalization (as a percent)55.00% 
Unsecured intermediate debt issued August 15, 2002
  
Debt  
Weighted-average interest rate (as a percent)6.53% 
Debt held by a company affiliated with one Board member3,000,000 
Series C, due August 15, 2012, 6.46%
  
Debt  
Debt Instrument, Gross75,000,00075,000,000
Long-term debt stated interest rate percentage6.46% 
Series D, due August 15, 2014, 6.56%
  
Debt  
Debt Instrument, Gross75,000,00075,000,000
Long-term debt stated interest rate percentage6.56% 
Minimum | Unsecured senior notes issued July 21, 2009
  
Debt  
Interest coverage ratio, numerator2.50 
Interest coverage ratio, denominator1.00 
Maximum | Unsecured senior notes issued July 21, 2009
  
Debt  
Funded leverage ratio (as a percent)55.00% 
Unsecured senior notes issued July 21, 2009
  
Debt  
Long-term debt stated interest rate percentage6.10% 
Face amount of the debt instrument200,000,000 
Number of equal annual principal repayments (in installments)5 
Annual principal repayments40,000,000 
Due July 21, 2012, 6.10%
  
Debt  
Debt Instrument, Gross40,000,00040,000,000
Long-term debt stated interest rate percentage6.10% 
Due July 21, 2013, 6.10%
  
Debt  
Debt Instrument, Gross40,000,00040,000,000
Long-term debt stated interest rate percentage6.10% 
Due July 21, 2014, 6.10%
  
Debt  
Debt Instrument, Gross40,000,00040,000,000
Long-term debt stated interest rate percentage6.10% 
Due July 21, 2015, 6.10%
  
Debt  
Debt Instrument, Gross40,000,00040,000,000
Long-term debt stated interest rate percentage6.10% 
Due July 21, 2016, 6.10%
  
Debt  
Debt Instrument, Gross40,000,00040,000,000
Long-term debt stated interest rate percentage6.10% 
Minimum | Unsecured senior credit facility due December 18, 2011
  
Debt  
Interest coverage ratio, numerator3.00 
Interest coverage ratio, denominator1.00 
LIBOR spread on borrowings (as a percent)0.30% 
Maximum | Unsecured senior credit facility due December 18, 2011
  
Debt  
Funded leverage ratio (as a percent)50.00% 
Number of days outstanding to have the option to borrow at the prime rate of interest30 
LIBOR spread on borrowings (as a percent)0.45% 
Unsecured senior credit facility due December 18, 2011
  
Debt  
Debt Instrument, Gross 10,000,000
Long-term debt stated interest rate percentage0.61% 
Maximum borrowing capacity that may be allowed to expire at maturity400,000,000 
Base rate for the variable rateLIBOR 
LIBOR spread on borrowings (as a percent)0.35% 
Commitment fee (as a percent)0.075% 
Number of letters of credit2 
Letters of credit outstanding21,900,000 
Available borrowing capacity$ 378,100,000 
Number of funded collateral trusts2