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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 29, 2019	Dec. 30, 2018
Segment Reporting Information [Line Items]
Sales	$ 120,406	$ 128,151	$ 407,785	$ 423,275
Gross profit	21,478	21,033	78,269	75,262
Selling, general, and administrative expenses	14,702	14,312	44,355	44,232
Operating income	6,776	6,721	33,914	31,030
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	63,018	69,026	206,433	212,446
Gross profit	8,418	8,288	30,007	27,059
Selling, general, and administrative expenses	6,050	5,589	18,041	16,866
Operating income	2,368	2,699	11,966	10,193
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	34,890	32,740	124,010	116,322
Gross profit	8,362	7,643	33,206	30,790
Selling, general, and administrative expenses	4,834	4,582	14,956	14,738
Operating income	3,528	3,061	18,250	16,052
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales	22,498	26,385	77,342	94,507
Gross profit	4,698	5,102	15,056	17,413
Selling, general, and administrative expenses	3,818	4,141	11,358	12,628
Operating income	$ 880	$ 961	$ 3,698	$ 4,785

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

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