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STATEMENTS OF CONSOLIDATED COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Statement of Comprehensive Income [Abstract]      
Net income $ 52,758 $ 62,640 $ 63,825
Net gains (losses) on cash flow hedging derivative instruments:      
Net hedging gain arising during the period 5,047 4,802 5,581
Reclassification adjustment for (gains) losses included in net income 302 (8,397) 1,861
Net unrealized (losses) gains on cash flow hedging derivative instruments 5,349 (3,595) 7,442
Defined benefit pension and other postretirement benefit plans:      
Net actuarial (loss) gain arising during the period (120) (3,397) 339
Amortization of actuarial loss included in net periodic pension and postretirement benefit cost 195 3,706 426
Net defined benefit pension and other postretirement benefit plans 75 309 765
Other Comprehensive (Loss) Income, Before Tax 5,424 (3,286) 8,207
Income Tax (Benefit) Expense Related to Items of Other Comprehensive (Loss) Income 2,094 (1,270) 3,170
Other Comprehensive (Loss) Income, Net of Tax 3,329 (2,016) 5,037
Comprehensive Income $ 56,087 $ 60,624 $ 68,862