Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 102,479	$ 81,193	$ 299,931	$ 273,433
Net Actuarial Change in Defined Benefit Plans
Amortization of Net Actuarial Loss	36	34	108	101
Tax Expense	(9)	(9)	(27)	(25)
Comprehensive Earnings	$ 102,506	$ 81,218	$ 300,012	$ 273,509