Employee Benefit Plans (Tables)

12 Months Ended

Mar. 31, 2020

Retirement Benefits [Abstract]

Schedule of Components of Net Postretirement Medical Expense

The components of net postretirement medical expense for the Officer Medical Plan were as follows: 

	Fiscal Year Ended March 31,
	2020		2019		2018
Service cost	$	4,955	$	5,952	$	4,464
Interest cost	4,859		5,130		5,008
Net actuarial loss	—		2,108		2,271
Total postretirement medical expense	$	9,814	$	13,190	$	11,743

Schedule of Weighted-average Discount Rate For Benefit Obligation

The weighted-average discount rate used to determine the year-end benefit obligations was as follows:     

	Fiscal Year Ended March 31,
	2020		2019		2018
Officer Medical Plan	3.60	%	4.10	%	4.10	%
Retired Officers’ Bonus Plan	3.60	%	4.10	%	4.10	%
Retired Vice Presidents' Bonus Plan	3.60	%	4.10	%	4.10	%

Schedule of Assumed Health Care Cost Trend Rates

Assumed healthcare cost trend rates for the Officer Medical Plan at March 31, 2020 and 2019 were as follows:    

Pre-65 initial rate	2020		2019
Healthcare cost trend rate assumed for next year	6.80	%	7.50	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate	2029		2027

Post-65 initial rate	2020		2019
Healthcare cost trend rate assumed for next year	7.00	%	7.75	%
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)	4.50	%	4.50	%
Year that the rate reaches the ultimate trend rate	2029		2027

Schedule of Change in Benefit Obligation

The changes in the benefit obligation, plan assets, and funded status of the Officer Medical Plan were as follows: 

	Fiscal Year Ended March 31,
	2020			2019			2018
Benefit obligation, beginning of the year	$	120,341		$	126,886		$	118,089
Service cost	4,955			5,952			4,464
Interest cost	4,859			5,130			5,008
Net actuarial (gain) loss	(6,761		)	(13,885		)	2,744
Benefits paid	(3,785		)	(3,742		)	(3,419		)
Benefit obligation, end of the year	$	119,609		$	120,341		$	126,886

Schedule of Change in Fair Value of Plan Assets

	Fiscal Year Ended March 31,
Changes in plan assets	2020			2019			2018
Fair value of plan assets, beginning of the year	$	—		$	—		$	—
Employer contributions	3,785			3,742			3,419
Benefits paid	(3,785		)	(3,742		)	(3,419		)
Fair value of plan assets, end of the year	$	—		$	—		$	—

Schedule of Expected Future Benefit Payments

The expected future medical benefit payments and related contributions are as follows:     

For the Fiscal Year Ending March 31,
2021	$	3,843
2022	$	4,235
2023	$	4,661
2024	$	5,052
2025	$	5,342
2026 - 2030	$	31,896