Consolidated Statements of Comprehensive Earnings - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Statement Of Income And Comprehensive Income [Abstract]
Net Earnings	$ 374,247	$ 339,444	$ 70,894
Net Actuarial Change in Defined Benefit Plans:
Unrealized Gain During the Period, net of tax expense of $48, $33 and $41	161	101	131
Amortization of Net Actuarial Gain (Loss), net of tax (expense) benefit of $39, $(49), and $(120)	104	(154)	(396)
Comprehensive Earnings	$ 374,512	$ 339,391	$ 70,629