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Segment Information (Tables)
12 Months Ended
Mar. 28, 2021
Segment Reporting [Abstract]  
Summary of Segment Information
Reportable SegmentsIndustrialWater
Treatment
Health and NutritionTotal
(In thousands)   
Fiscal Year Ended March 28, 2021:
Sales$273,361 $170,004 $153,506 $596,871 
Gross profit43,337 46,793 33,632 123,762 
Selling, general, and administrative expenses27,033 24,453 16,398 67,884 
Operating income16,304 22,340 17,234 55,878 
Identifiable assets*$181,478 $109,761 $166,558 $457,797 
       Capital expenditures$13,713 $6,732 $349 $20,794 
Fiscal Year Ended March 29, 2020:
Sales$275,224 $159,895 $105,079 $540,198 
Gross profit38,936 41,902 20,079 100,917 
Selling, general, and administrative expenses24,123 19,801 15,322 59,246 
Operating income (loss)14,813 22,101 4,757 41,671 
Identifiable assets*$173,068 $63,506 $139,780 $376,354 
       Capital expenditures$14,933 $9,160 $456 $24,549 
Fiscal Year Ended March 31, 2019:
Sales$281,860 $149,490 $124,976 $556,326 
Gross profit34,900 37,986 23,050 95,936 
Selling, general, and administrative expenses22,759 19,498 16,861 59,118 
Operating income12,141 18,488 6,189 36,818 
Identifiable assets*$162,926 $58,274 $146,042 $367,242 
       Capital expenditures$7,319 $4,506 $793 $12,618 
* Unallocated assets not included, consisting primarily of cash and cash equivalents, investments and prepaid expenses, were $14.8 million at March 28, 2021, $13.0 million at March 29, 2020 and $18.4 million at March 31, 2019.