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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, 2013
Mar. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Net income $ 45,469 $ 54,535 $ 105,675 $ 111,892
Other comprehensive income, net of tax        
Unrealized gain (loss) on available for sale securities, net of tax of $(447), $575, $(226) and $(25), respectively (1) 647 [1] (833) [1] 327 [1] 36 [1]
Net unrealized (loss) on derivatives, net of tax of $4, $18, $10 and $41, respectively (7) (30) (17) (70)
Adjustment to postemployment benefit obligation, net of tax of $(202), $(149), $(405) and $(299), respectively 296 219 709 438
Other comprehensive income (loss) 936 (644) 1,019 404
Comprehensive income $ 46,405 $ 53,891 $ 106,694 $ 112,296
[1] Available for sale securities are included in other noncurrent assets on the Unaudited Condensed Consolidated Balance Sheets.