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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Net income $ 172,971 $ 45,469 $ 180,664 $ 105,675
Other comprehensive income, net of tax        
Unrealized gain (loss) on available for sale securities, net of tax of $(11), $(447), $203, and $(226), respectively 15 647 (295) 327
Net unrealized (loss) on derivatives, net of tax of $89, $4, $109, and $10, respectively (152) (7) (186) (17)
Adjustment to postemployment benefit obligation, net of tax of $(112), $(202), $(223) and $(405), respectively 161 296 322 709
Other comprehensive income (loss) 24 936 (159) 1,019
Comprehensive income $ 172,995 $ 46,405 $ 180,505 $ 106,694