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Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 95,327	$ 96,206
Net Actuarial Change in Defined Benefit Plans
Amortization of Net Actuarial Loss	36	33
Tax Expense	(9)	(8)
Comprehensive Earnings	$ 95,354	$ 96,231

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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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