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FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) (USD $)
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2009
Assets        
Short-term investments   $ 25,829,000 $ 84,081,000 $ 8,127,000
Debt instruments        
Fair Value 12,500,000 17,500,000 21,600,000 25,100,000
Carrying value of long-term debt 11,503,000 15,918,000 20,494,000 25,124,000
Assets and liabilities measured at fair value on a recurring basis | Level 1
        
Assets        
Cash equivalents 171,300,000 266,842,000 129,756,000 178,893,000
Total assets measured at fair value 171,300,000 266,842,000 129,756,000 178,893,000
Assets and liabilities measured at fair value on a recurring basis | Level 2
        
Assets        
Current derivative assets 3,779,000 7,466,000 11,428,000 18,106,000
Non-current derivative assets 3,713,000      
Total assets measured at fair value 7,492,000 33,295,000 95,509,000 26,233,000
Liabilities        
Current derivative liabilities 6,839,000 7,522,000 3,193,000 17,933,000
Non-current derivative liabilities 6,498,000 6,164,000 4,748,000  
Total liabilities measured at fair value 13,337,000 13,686,000 7,941,000 17,933,000
Assets and liabilities measured at fair value on a recurring basis | Total
        
Assets        
Cash equivalents 171,300,000 266,842,000 129,756,000 178,893,000
Current derivative assets 3,779,000 7,466,000 11,428,000 18,106,000
Non-current derivative assets 3,713,000      
Total assets measured at fair value 178,792,000 300,137,000 225,265,000 205,126,000
Liabilities        
Current derivative liabilities 6,839,000 7,522,000 3,193,000 17,933,000
Non-current derivative liabilities 6,498,000 6,164,000 4,748,000  
Total liabilities measured at fair value 13,337,000 13,686,000 7,941,000 17,933,000
Short-term investments - tax exempt bonds | Assets and liabilities measured at fair value on a recurring basis | Level 2
        
Assets        
Short-term investments   25,829,000 48,081,000  
Short-term investments - tax exempt bonds | Assets and liabilities measured at fair value on a recurring basis | Total
        
Assets        
Short-term investments   25,829,000 48,081,000  
Short-term investments -U.S. government agency | Assets and liabilities measured at fair value on a recurring basis | Level 2
        
Assets        
Short-term investments     36,000,000 8,127,000
Short-term investments -U.S. government agency | Assets and liabilities measured at fair value on a recurring basis | Total
        
Assets        
Short-term investments     $ 36,000,000 $ 8,127,000