Retirement Plans - 401(k) (Details) - USD ($)	12 Months Ended
Mar. 31, 2019	Apr. 01, 2018	Mar. 26, 2017
Retirement Plans
Defined contribution plan expense	$ 957,100	$ 928,100	$ 621,600
Common stock shares included in plan assets (in shares)	171,300

Amount of cost for defined contribution plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration