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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |  |
Net income (loss) |  | $ (23,098) | $ (8,005) | $ 51,542 | $ 76,955
Other comprehensive income: |  |  |  |  |
Unrealized gain on pension plan obligation | [1] | 455 | 448 | 1,366 | 1,344
Tax effect of unrealized gain on pension plan obligation |  | (124) | (120) | (373) | (422)
Unrealized gain (loss) on captive insurance collateral |  | 666 | (220) | 1,960 | (1,151)
Tax effect of unrealized gain (loss) on captive insurance collateral |  | (140) | 46 | (416) | 242
Unrealized loss on interest rate hedges |  | (733) |  | (1,845) |
Tax effect of unrealized loss on interest rate hedges |  | 196 |  | 488 |
Total other comprehensive income |  | 320 | 154 | 1,180 | 13
Total comprehensive income (loss) |  | $ (22,778) | $ (7,851) | $ 52,722 | $ 76,968
[1] | This item is included in the computation of net periodic pension cost.

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