Consolidated Statements of Comprehensive Earnings (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 129,138	$ 117,184	$ 400,540	$ 361,184
Net Actuarial Change in Defined Benefit Plans
Amortization of Net Actuarial Loss	63	30	189	90
Tax Expense	(15)	(7)	(45)	(20)
Comprehensive Earnings	$ 129,186	$ 117,207	$ 400,684	$ 361,254