Retirement Plans - Supplemental Plan (Details) - USD ($)	Mar. 31, 2019	Apr. 01, 2018
Defined Benefit Plan
Plan type	us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember	us-gaap:SupplementalEmployeeRetirementPlanDefinedBenefitMember
Other long-term assets
Defined Benefit Plan
Cash surrender value of life insurance policy	$ 2,326,800	$ 2,204,500
Other long-term liabilities
Defined Benefit Plan
Net present value of benefit obligation	$ 853,400	$ 901,400

Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Indicates type of defined benefit plan. Includes, but is not limited to, pension plan, other postretirement plan and special and contractual termination benefits payable upon retirement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 712
-SubTopic 10
-Section 15
-Paragraph 4
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