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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, 2023
Mar. 31, 2022
Mar. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of the year $ 113,505 $ 121,518 $ 119,609
Service cost 6,117 6,505 5,657
Interest cost 4,182 4,063 4,237
Net actuarial gain (14,288) (13,563) (3,466)
Benefits paid (3,931) (5,018) (4,519)
Benefit obligation, end of the year 105,585 113,505 121,518
Changes in plan assets      
Fair value of plan assets, beginning of the year 0 0 0
Employer contributions 3,931 5,018 4,519
Benefits paid (3,931) (5,018) (4,519)
Fair value of plan assets, end of the year $ 0 $ 0 $ 0