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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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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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