Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 28, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenue	$ 143,172	$ 147,336
Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	38,644	44,326
Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	103,446	101,765
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,082	1,245
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue	71,502	75,325
Industrial [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	8,824	15,013
Industrial [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	61,842	59,471
Industrial [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	836	841
Water Treatment [Member]
Disaggregation of Revenue [Line Items]
Revenue	39,714	43,252
Water Treatment [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,875	4,708
Water Treatment [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	35,506	38,150
Water Treatment [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	333	394
Health and Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenue	31,956	28,759
Health and Nutrition [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	25,945	24,605
Health and Nutrition [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	6,098	4,144
Health and Nutrition [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ (87)	$ 10