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Employee Retirement Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, minimum annual contributions per participating employee (as percent)	1.00%
Defined contribution plan, maximum annual contributions per employee (as percent)	70.00%
Defined contribution plan, cost recognized	$ 1,500,000	$ 1,500,000	$ 1,600,000
Defined benefit obligation	61,570,000	60,334,000	61,882,000
Net periodic benefit cost (income)	$ (559,000)	$ (690,000)	(372,000)
Expected return on plan assets, net of administrative fees (as percent)	5.00%	5.75%
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Net periodic benefit cost (income)	$ (1,000,000.0)
Qualified plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Contributions to the qualified plan	1,000,000.0	$ 1,000,000.0	$ 0
Unfunded plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit obligation	$ 4,600,000	$ 4,600,000
Contribution Tranche One
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contribution, percent of match (as percent)	100.00%
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)	3.00%
Contribution Tranche Two
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contribution, percent of match (as percent)	50.00%
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)	3.00%

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Defined Contribution Plan, Minimum Annual Contributions Per Participating Employee, Percent

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Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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