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Employee Benefit Plans - Components of Net Postretirement Medical Expense (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 Disclosure [Line Items]
Service cost	$ 6,117	$ 6,505	$ 5,657
Interest cost	4,182	4,063	4,237
Total postretirement medical expense	$ 10,299	$ 10,568	$ 9,894

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Amount of cost recognized for passage of time related to defined benefit plan.

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Amount of net periodic benefit cost (credit) for defined benefit plan.

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