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Employee Benefit Plans - Change in Benefit Obligation and Change in Plan Assets (Details) - Officer Medical Plan - Other Postretirement Benefits Plan - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of the year $ 105,585 $ 113,505 $ 121,518
Service cost 5,100 6,117 6,505
Interest cost 5,067 4,182 4,063
Net actuarial loss (gain) 17,163 (14,288) (13,563)
Benefits paid (5,927) (3,931) (5,018)
Benefit obligation, end of the year 126,988 105,585 113,505
Changes in plan assets      
Fair value of plan assets, beginning of the year 0 0 0
Employer contributions 5,927 3,931 5,018
Benefits paid (5,927) (3,931) (5,018)
Fair value of plan assets, end of the year $ 0 $ 0 $ 0