Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 29, 2019	Dec. 30, 2018	Dec. 29, 2019	Dec. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 120,406	$ 128,151	$ 407,785	$ 423,275
Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	35,081	43,868	119,045	146,216
Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	84,016	82,674	284,886	272,558
Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	1,309	1,609	3,854	4,501
Industrial [Member]
Disaggregation of Revenue [Line Items]
Revenue	63,018	69,026	206,433	212,446
Industrial [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	11,615	15,740	38,405	45,983
Industrial [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	50,547	52,130	165,447	163,366
Industrial [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	856	1,156	2,581	3,097
Water Treatment [Member]
Disaggregation of Revenue [Line Items]
Revenue	34,890	32,740	124,010	116,322
Water Treatment [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	4,280	5,195	13,959	16,999
Water Treatment [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	30,251	27,189	108,888	98,153
Water Treatment [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	359	356	1,163	1,170
Health and Nutrition [Member]
Disaggregation of Revenue [Line Items]
Revenue	22,498	26,385	77,342	94,507
Health and Nutrition [Member] | Bulk / Distributed specialty products [Member]
Disaggregation of Revenue [Line Items]
Revenue	19,186	22,933	66,681	83,234
Health and Nutrition [Member] | Manufactured, blended or repackaged products [Member]
Disaggregation of Revenue [Line Items]
Revenue	3,218	3,355	10,551	11,039
Health and Nutrition [Member] | Other [Member]
Disaggregation of Revenue [Line Items]
Revenue	$ 94	$ 97	$ 110	$ 234