Employee Benefit Plans - Schedule of Change in Fair Value of Plan Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Change in fair value of plan assets
Fair value of plan assets at beginning of year	$ 1,306,456
Company contributions	9,143	$ 9,329	$ 2,998
Fair value of plan assets at end of year	1,280,191	1,306,456
Reconciliation of amounts recognized on the consolidated balance sheets
Accrued benefit liability—noncurrent	(283,634)	(359,375)
Pension Plan [Member]
Change in fair value of plan assets
Fair value of plan assets at beginning of year	1,306,456	1,649,241
Actual return on plan assets	82,565	(177,419)
Participant contributions	117	115
Company contributions	40,239	1,100
Benefits paid	(149,890)	(163,615)
Currency translation adjustment	704	(2,966)
Fair value of plan assets at end of year	1,280,191	1,306,456	$ 1,649,241
Funded status (underfunded)
Funded status	(277,589)	(353,967)
Reconciliation of amounts recognized on the consolidated balance sheets
Pension asset—noncurrent	5,953	5,124
Accrued benefit liability—current	(757)	(768)
Accrued benefit liability—noncurrent	(282,785)	(358,323)
Net amount recognized	(277,589)	(353,967)
Reconciliation of amounts recognized in accumulated other comprehensive income
Prior service costs (credits)	1,254	1,356
Actuarial losses (gains)	714,855	756,664
Income tax (benefits) expenses related to above items	(204,132)	(204,132)
Unamortized benefit plan costs (gains)	511,977	553,888
Other postretirement [Member]
Reconciliation of amounts recognized in accumulated other comprehensive income
Prior service costs (credits)	(38,795)	(43,900)
Actuarial losses (gains)	(41,678)	(45,347)
Income tax (benefits) expenses related to above items	42,016	42,016
Unamortized benefit plan costs (gains)	$ (38,457)	$ (47,231)