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Financial Instruments (Details) (USD $)
Mar. 31, 2013
Sep. 30, 2012
Financial Instruments (Details) [Abstract]    
Other Assets Fair Value Disclosure $ 414,000,000 $ 230,000,000
Long Term Debt 1,396,272,000 1,395,931,000
Debt Instrument Fair Value $ 1,557,000,000 $ 1,584,700,000