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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 96,206	$ 41,304
Net Actuarial Change in Defined Benefit Plans:
Amortization of net actuarial loss	33	43
Tax expense	(8)	(10)
Comprehensive Earnings	$ 96,231	$ 41,337

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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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