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Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 68,860	$ 256,632	$ 198,219
Net Actuarial Change in Defined Benefit Plans:
Unrealized gain during the period, net of tax expense of $68, $1,995, and $1,544	224	3,407	2,765
Amortization of net actuarial loss, net of tax benefit of $149, $301, and $760	472	955	1,248
Reclassification of Income Tax Effects to Retained Earnings		(978)
Comprehensive Earnings	$ 69,556	$ 260,016	$ 202,232

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Tax cuts and jobs act of 2017, other comprehensive income (loss), reclassification of income tax effects to retained earnings.

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