Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 01, 2017	Dec. 27, 2015	Jan. 01, 2017	Dec. 27, 2015
Segment Reporting Information [Line Items]
Sales	$ 112,351	$ 88,375	$ 364,975	$ 284,463
Gross profit	20,912	14,709	76,160	55,255
Selling, general, and administrative expenses	14,916	12,825	44,913	33,019
Operating income	5,996	1,884	31,247	22,236
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	57,083	59,326	176,717	185,260
Gross profit	8,371	7,474	28,978	27,372
Selling, general, and administrative expenses	5,467	5,421	16,254	16,061
Operating income	2,904	2,053	12,724	11,311
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	28,098	29,049	100,590	99,203
Gross profit	7,242	7,235	28,943	27,883
Selling, general, and administrative expenses	4,808	4,714	14,825	14,268
Operating income	2,434	2,521	14,118	13,615
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales	27,170	0	87,668	0
Gross profit	5,299	0	18,239	0
Selling, general, and administrative expenses	4,641	2,690	13,834	2,690
Operating income	$ 658	$ (2,690)	$ 4,405	$ (2,690)

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=26872669&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=51677171&loc=d3e3636-108311

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