Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Segment Reporting Information [Line Items]
Sales	$ 145,324	$ 125,395	$ 295,124	$ 259,126
Gross profit	25,772	24,115	54,229	50,114
Selling, general, and administrative expenses	14,941	14,828	29,920	30,594
Operating income	10,831	9,287	24,309	19,520
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	69,402	58,689	143,420	122,716
Gross profit	8,328	8,308	18,771	17,281
Selling, general, and administrative expenses	5,790	5,295	11,277	11,051
Operating income	2,538	3,013	7,494	6,230
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	42,713	38,217	83,582	76,441
Gross profit	11,710	11,028	23,147	22,231
Selling, general, and administrative expenses	5,055	5,042	10,156	10,299
Operating income	6,655	5,986	12,991	11,932
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales	33,209	28,489	68,122	59,969
Gross profit	5,734	4,779	12,311	10,602
Selling, general, and administrative expenses	4,096	4,491	8,487	9,244
Operating income	$ 1,638	$ 288	$ 3,824	$ 1,358

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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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

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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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