Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 477,639	$ 461,540	$ 374,247
Net Actuarial Change in Defined Benefit Plans:
Unrealized (Loss) Gain During the Period, net of tax (benefit) expense of $(24), $(147), and $48	(53)	(465)	161
Amortization of Net Actuarial Gain (Loss), net of tax (expense) benefit of $59, $30, and $39	192	93	104
Comprehensive Earnings	$ 477,778	$ 461,168	$ 374,512