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INCOME TAXES, COMPONENTS OF INCOME TAX PROVISION (BENEFIT) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Current      
Federal $ 12,248 $ 14,983 $ 14,566
State 1,763 4,025 6,618
Deferred      
Federal 34,127 18,757 30,932
State 6,186 4,361 (1,301)
Investment tax credits (18,749) (34,397) (13,150)
Income tax provision $ 35,575 $ 7,729 $ 37,665