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Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Statement Of Income And Comprehensive Income [Abstract] |  |  |
Net Earnings | $ 256,632 | $ 198,219 | $ 152,592
Net Actuarial Change in Defined Benefit Plans: |  |  |
Unrealized gain (loss) during the period, net of tax (expense) benefit of ($1,995), ($1,544) and $488 | 3,407 | 2,765 | (613)
Amortization of net actuarial loss, net of tax benefit of $301, $760 and $242 | 955 | 1,248 | 1,271
Reclassification of Income Tax Effects to Retained Earnings | (978) |  |
Comprehensive Earnings | $ 260,016 | $ 202,232 | $ 153,250

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