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Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 28, 2021	Mar. 29, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Sales	$ 596,871	$ 540,198	$ 556,326
Industrial [Member]
Disaggregation of Revenue [Line Items]
Sales	273,361	275,224	281,860
Water Treatment [Member]
Disaggregation of Revenue [Line Items]
Sales	170,004	159,895	149,490
Health and Nutrition [Member]
Disaggregation of Revenue [Line Items]
Sales	153,506	105,079	124,976
Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Sales	169,762	158,410	191,827
Bulk / Distributed specialty products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Sales	38,378	49,864	60,947
Bulk / Distributed specialty products [Member] | Water Treatment [Member]
Disaggregation of Revenue [Line Items]
Sales	16,067	18,481	21,813
Bulk / Distributed specialty products [Member] | Health and Nutrition [Member]
Disaggregation of Revenue [Line Items]
Sales	115,317	90,065	109,067
Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Sales	422,391	376,848	358,775
Manufactured, blended or repackaged products [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Sales	231,427	222,161	216,874
Manufactured, blended or repackaged products [Member] | Water Treatment [Member]
Disaggregation of Revenue [Line Items]
Sales	152,694	139,917	126,217
Manufactured, blended or repackaged products [Member] | Health and Nutrition [Member]
Disaggregation of Revenue [Line Items]
Sales	38,270	14,770	15,684
Other [Member]
Disaggregation of Revenue [Line Items]
Sales	4,718	4,940	5,724
Other [Member] | Industrial [Member]
Disaggregation of Revenue [Line Items]
Sales	3,556	3,199	4,039
Other [Member] | Water Treatment [Member]
Disaggregation of Revenue [Line Items]
Sales	1,243	1,497	1,460
Other [Member] | Health and Nutrition [Member]
Disaggregation of Revenue [Line Items]
Sales	$ (81)	$ 244	$ 225

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