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Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 66,339	$ 54,882
Net Actuarial Change in Defined Benefit Plans:
Amortization of net actuarial loss	73	314
Tax expense	(17)	(117)
Comprehensive Earnings	$ 66,395	$ 55,079

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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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