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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Statement Of Income And Comprehensive Income [Abstract] |  |  |  |
Net Earnings | $ 56,387 | $ 45,848 | $ 161,968 | $ 113,429
Change in Funded Status of Defined Benefit Plans: |  |  |  |
Amortization of Net Actuarial Loss | 500 | 506 | 1,500 | 1,522
Tax Expense | (188) | (188) | (564) | (564)
Comprehensive Earnings | $ 56,699 | $ 46,166 | $ 162,904 | $ 114,387

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