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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (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 $ 41,679 $ 40,482 $ 51,431 $ 43,413
Other comprehensive income:        
Unrealized gain on pension plan obligation 664 [1] 688 [1] 1,328 [1],[2] 1,376 [1]
Tax effect of unrealized gain on pension plan (271) (280) (542) (561)
Total other comprehensive income 393 408 786 815
Total comprehensive income $ 42,072 $ 40,890 $ 52,217 $ 44,228
[1] These items are included in the computation of net periodic pension cost. See Note 9 - Employee Benefit Plan.
[2] These items are included in the computation of net periodic pension costs. See Note 9-Employee Benefit Plan.