Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
Jul. 02, 2017	Jul. 03, 2016
Segment Reporting Information [Line Items]
Sales	$ 133,731	$ 131,374
Gross profit	25,999	28,216
Selling, general, and administrative expenses	15,766	15,126
Operating income	10,233	13,090
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	64,027	63,788
Gross profit	8,973	10,422
Selling, general, and administrative expenses	5,756	5,395
Operating income	3,217	5,027
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	38,224	35,636
Gross profit	11,203	10,629
Selling, general, and administrative expenses	5,257	5,064
Operating income	5,946	5,565
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales	31,480	31,950
Gross profit	5,823	7,165
Selling, general, and administrative expenses	4,753	4,667
Operating income	$ 1,070	$ 2,498

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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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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