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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net income |  | $ 2,315 | $ 30,182
Other comprehensive income: |  |  |
Unrealized gain on pension plan obligation | [1] | 454 | 448
Tax effect of unrealized gain on pension plan obligation |  | (124) | (135)
Unrealized gain on investments |  | 389 |
Tax effect of unrealized gain on investments |  | (82) |
Unrealized loss on interest rate hedges |  | (745) |
Tax effect of unrealized loss on interest rate hedges |  | 197 |
Total other comprehensive income |  | 89 | 313
Total comprehensive income |  | $ 2,404 | $ 30,495
[1] | This item is included in the computation of net periodic pension cost.

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