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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016
Net earnings | $ 92,136 | $ 53,703 | $ 45,882
Other comprehensive (loss) income, net of tax: |  |  |
Foreign currency translation adjustments | (2,254) | 6,383 | (1,462)
Amortization of prior service costs and actuarial (losses) gains | (2,003) | 5,573 | (5,250)
Net unrealized gain (loss) on derivative instruments | 37 | 19 | (33)
Total other comprehensive (loss) income, net of tax | (4,220) | 11,975 | (6,745)
Comprehensive income | $ 87,916 | $ 65,678 | $ 39,137

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