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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Statement Of Income And Comprehensive Income [Abstract]    
Net income $ 30,182 $ 18,275
Other comprehensive income:    
Unrealized gain on pension plan obligation (1) [1] 448 534
Tax effect of unrealized gain on pension plan (135) (216)
Total other comprehensive income 313 318
Total comprehensive income $ 30,495 $ 18,593
[1] This item is included in the computation of net periodic pension cost.