Consolidated Statements of Comprehensive Earnings (unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 150,553	$ 138,995	$ 271,402	$ 244,000
Net Actuarial Change in Defined Benefit Plans
Amortization of Net Actuarial Loss	63	30	126	60
Tax Expense	(15)	(6)	(30)	(13)
Comprehensive Earnings	$ 150,601	$ 139,019	$ 271,498	$ 244,047