Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Segment Reporting Information [Line Items]
Sales	$ 94,592	$ 88,881	$ 196,088	$ 186,917
Gross profit	19,811	18,122	40,546	36,618
Selling, general and administrative expenses	10,303	8,271	20,194	17,146
Operating income	9,508	9,851	20,352	19,472
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	58,346	57,935	125,934	125,481
Gross profit	9,184	8,363	19,898	17,724
Selling, general and administrative expenses	5,441	4,717	10,640	9,816
Operating income	3,743	3,646	9,258	7,908
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	36,246	30,946	70,154	61,436
Gross profit	10,627	9,759	20,648	18,894
Selling, general and administrative expenses	4,862	3,554	9,554	7,330
Operating income	$ 5,765	$ 6,205	$ 11,094	$ 11,564

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.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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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