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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.

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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