Segment Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 31, 2019
Summary of Segment Information
Sales	$ 596,871	$ 540,198	$ 556,326
Gross profit	123,762	100,917	95,936
Selling, general, and administrative expenses	67,884	59,246	59,118
Operating income	55,878	41,671	36,818
Assets	472,550	389,328
Capital expenditures	20,794	24,549	12,618
Industrial [Member]
Summary of Segment Information
Sales	273,361	275,224	281,860
Gross profit	43,337	38,936	34,900
Selling, general, and administrative expenses	27,033	24,123	22,759
Operating income	16,304	14,813	12,141
Assets	181,478	173,068	162,926
Capital expenditures	13,713	14,933	7,319
Water Treatment [Member]
Summary of Segment Information
Sales	170,004	159,895	149,490
Gross profit	46,793	41,902	37,986
Selling, general, and administrative expenses	24,453	19,801	19,498
Operating income	22,340	22,101	18,488
Assets	109,761	63,506	58,274
Capital expenditures	6,732	9,160	4,506
Health and Nutrition [Member]
Summary of Segment Information
Sales	153,506	105,079	124,976
Gross profit	33,632	20,079	23,050
Selling, general, and administrative expenses	16,398	15,322	16,861
Operating income	17,234	4,757	6,189
Assets	166,558	139,780	146,042
Capital expenditures	349	456	793
Identifiable
Summary of Segment Information
Assets	457,797	376,354	367,242
Unallocated
Summary of Segment Information
Assets	$ 14,800	$ 13,000	$ 18,400