Goodwill and Intangible Assets-Goodwill Rollforward (Details) $ in Thousands	12 Months Ended
Mar. 29, 2020 USD ($) Segment	Mar. 31, 2019 USD ($)	Apr. 01, 2018 USD ($)
Goodwill [Line Items]
Number of Reportable Segments \| Segment	3
Goodwill	$ 58,440	$ 58,440	$ 58,440
Industrial [Member]
Goodwill [Line Items]
Goodwill	6,495	6,495	6,495
Water Treatment [Member]
Goodwill [Line Items]
Goodwill	7,000	7,000	7,000
Health and Nutrition [Member]
Goodwill [Line Items]
Goodwill	$ 44,945	$ 44,945	$ 44,945

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

Name:	us-gaap_Goodwill
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant