Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2019	Jul. 01, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 147,336	$ 149,800
Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	44,401	51,435
Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	101,688	96,876
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,247	1,489
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue	75,325	74,018
Industrial [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	15,090	14,936
Industrial [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	59,394	58,032
Industrial [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	841	1,050
Water Treatment [Member]
Disaggregation of Revenue [Line Items]
Revenue	43,252	40,869
Water Treatment [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,708	5,822
Water Treatment [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	38,150	34,659
Water Treatment [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	394	388
Health and Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenue	28,759	34,913
Health and Nutrition [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	24,603	30,677
Health and Nutrition [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,144	4,185
Health and Nutrition [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 12	$ 51