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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Net income $ 141,970 $ 114,809 $ 92,879
Other comprehensive income, net of tax      
Unrealized (loss) gain on available for sale securities, net of tax of $426, $(330) and $(270), respectively (618) [1] 479 [1] 391 [1]
Net unrealized (loss) on derivatives, net of tax of $61, $23 and $71, respectively (105) (39) (122)
Adjustment to postemployment benefit obligation, net of tax of $2,162, $(5,934) and $345, respectively (3,250) 8,710 (436)
Other comprehensive (loss) income (3,973) 9,150 (167)
Comprehensive income $ 137,997 $ 123,959 $ 92,712
[1] Available for sale securities are included in other noncurrent assets on the Consolidated Balance Sheets.