Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 01, 2018	Jul. 02, 2017
Segment Reporting Information [Line Items]
Sales	$ 149,800	$ 133,731
Gross profit	28,457	25,999
Selling, general, and administrative expenses	14,979	15,766
Operating income	13,478	10,233
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	74,018	64,027
Gross profit	10,443	8,973
Selling, general, and administrative expenses	5,487	5,756
Operating income	4,956	3,217
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	40,869	38,224
Gross profit	11,437	11,203
Selling, general, and administrative expenses	5,101	5,257
Operating income	6,336	5,946
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales	34,913	31,480
Gross profit	6,577	5,823
Selling, general, and administrative expenses	4,391	4,753
Operating income	$ 2,186	$ 1,070

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+ References

No definition available.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 30
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311

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