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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net Earnings | $ 57,715 | $ 101,380 | $ 196,657 | $ 219,624
Net Actuarial Change in Defined Benefit Plans: |  |  |  |
Amortization of net actuarial loss | 73 | 314 | 219 | 942
Tax expense | (17) | (117) | (51) | (351)
Comprehensive Earnings | $ 57,771 | $ 101,577 | $ 196,825 | $ 220,215

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