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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2016
Statement of Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net (loss) income | $ 133 | $ (2,193) | $ (17,060) | $ 840 | $ (1,837) | $ 2,846 | $ 20,728 | $ 814 | $ (18,280) | $ 22,551 | $ 71,791
Other comprehensive income (loss), net of tax: |  |  |  |  |  |  |  |  |  |  |
Unrealized (losses) gains on derivative instruments designated as cash flow hedges, net of tax |  |  |  |  |  |  |  |  | (5,922) |  |
Losses (gains) on derivative instruments designated as cash flow hedges reclassified to cost of goods sold, net of tax |  |  |  |  |  |  |  |  | 800 |  |
Change in the funded status of retiree benefit obligations, net of tax |  |  |  |  |  |  |  |  | 4,576 | 7,466 | (11,461)
Total comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  | $ (18,826) | $ 27,627 | $ 70,974

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