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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 96,034	$ 71,793	$ 192,240	$ 113,097
Net Actuarial Change in Defined Benefit Plans:
Amortization of net actuarial loss	34	43	67	88
Tax expense	(8)	(10)	(16)	(20)
Comprehensive Earnings	$ 96,060	$ 71,826	$ 192,291	$ 113,165

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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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