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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 02, 2017	Jan. 01, 2017	Oct. 02, 2016	Jul. 03, 2016	Apr. 03, 2016	Dec. 27, 2015	Sep. 27, 2015	Jun. 28, 2015	Apr. 02, 2017	Apr. 03, 2016	Mar. 29, 2015
Segment Reporting Information [Line Items]
Sales	$ 118,618	$ 112,351	$ 121,250	$ 131,374	$ 129,513	$ 88,375	$ 94,592	$ 101,496	$ 483,593	$ 413,976	$ 364,023
Gross profit	21,913	20,912	27,032	28,216	25,002	14,709	19,811	20,735	98,073	80,257	65,791
Selling, general, and administrative expenses	14,468	14,916	14,871	15,126	16,067	12,825	10,303	9,891	59,381	49,086	35,375
Operating income	7,445	5,996	12,161	13,090	8,935	1,884	9,508	10,844	38,692	31,171	30,416
Net income	$ 4,210	$ 3,551	$ 7,190	$ 7,604	$ 4,859	$ 815	$ 5,678	$ 6,791	$ 22,555	$ 18,143	$ 19,214
Basic earnings per share	$ 0.40	$ 0.34	$ 0.68	$ 0.72	$ 0.46	$ 0.08	$ 0.54	$ 0.64	$ 2.14	$ 1.72	$ 1.82
Diluted earnings per share	$ 0.40	$ 0.34	$ 0.68	$ 0.72	$ 0.46	$ 0.08	$ 0.54	$ 0.64	$ 2.13	$ 1.72	$ 1.81
Stauber Performance Ingredients [Member]
Segment Reporting Information [Line Items]
Business Combination, Acquisition Related Costs					$ 600	$ 2,700				$ 3,300
Industrial [Member]
Segment Reporting Information [Line Items]
Sales									$ 238,555	251,749	$ 249,066
Gross profit									38,886	37,967	33,619
Selling, general, and administrative expenses									21,818	22,137	19,793
Operating income									17,068	15,830	13,826
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales									128,954	128,312	114,957
Gross profit									35,962	35,470	32,172
Selling, general, and administrative expenses									19,798	19,261	15,582
Operating income									16,164	16,209	16,590
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales									116,084	33,915	0
Gross profit									23,225	6,820	0
Selling, general, and administrative expenses									17,765	7,688	0
Operating income									$ 5,460	$ (868)	$ 0