Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net Earnings	$ 461,540	$ 374,247	$ 339,444
Net Actuarial Change in Defined Benefit Plans:
Unrealized (Loss) Gain During the Period, net of tax (benefit) expense of $(147), $48, and $33	(465)	161	101
Amortization of Net Actuarial Gain (Loss), net of tax (expense) benefit of $30, $39, and $(49)	93	104	(154)
Comprehensive Earnings	$ 461,168	$ 374,512	$ 339,391