Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Segment Reporting Information [Line Items]
Sales	$ 125,395	$ 121,250	$ 259,126	$ 252,624
Gross profit	24,115	27,032	50,114	55,248
Selling, general, and administrative expenses	14,828	14,871	30,594	29,997
Operating income	9,287	12,161	19,520	25,251
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	58,689	55,846	122,716	119,634
Gross profit	8,308	10,185	17,281	20,607
Selling, general, and administrative expenses	5,295	5,392	11,051	10,787
Operating income	3,013	4,793	6,230	9,820
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	38,217	36,856	76,441	72,492
Gross profit	11,028	11,072	22,231	21,701
Selling, general, and administrative expenses	5,042	4,953	10,299	10,017
Operating income	5,986	6,119	11,932	11,684
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales	28,489	28,548	59,969	60,498
Gross profit	4,779	5,775	10,602	12,940
Selling, general, and administrative expenses	4,491	4,526	9,244	9,193
Operating income	$ 288	$ 1,249	$ 1,358	$ 3,747

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

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The net result for the period of deducting operating expenses from operating revenues.

+ 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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