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Segment Information
 12 Months Ended
Mar. 31, 2024
Segment Reporting [Abstract]  
Segment Information Segment Information
We have three reportable segments: Industrial, Water Treatment and Health and Nutrition. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. Product costs and expenses for each segment are based on actual costs incurred along with cost allocations of shared and centralized functions.

We evaluate performance based on operating income. Reportable segments are defined primarily by product and type of customer. Segments are responsible for the sales, marketing and development of their products and services. Other than our Health and Nutrition segment, the segments do not have separate customer service or purchasing functions. There are no intersegment sales and no operating segments have been aggregated.
Reportable SegmentsIndustrialWater
Treatment		Health and NutritionTotal
(In thousands)   
Fiscal Year Ended March 31, 2024:
Sales$409,465 $363,289 $146,408 $919,162 
Gross profit67,545 98,498 27,593 193,636 
Selling, general, and administrative expenses28,316 45,286 15,998 89,600 
Operating income39,229 53,212 11,595 104,036 
Identifiable assets*$239,586 $255,188 $134,915 $629,689 
       Capital expenditures$24,280 $15,739 $132 $40,151 
Fiscal Year Ended April 2, 2023:
Sales$470,760 $304,925 $159,413 $935,098 
Gross profit68,115 67,208 29,796 165,119 
Selling, general, and administrative expenses25,703 35,734 15,532 76,969 
Operating income42,412 31,474 14,264 88,150 
Identifiable assets*$253,436 $155,430 $155,626 $564,492 
       Capital expenditures$31,635 $16,311 $375 $48,321 
Fiscal Year Ended April 3, 2022:
Sales$386,938 $228,133 $159,470 $774,541 
Gross profit59,606 54,571 32,343 146,520 
Selling, general, and administrative expenses28,127 31,357 15,842 75,326 
Operating income31,479 23,214 16,501 71,194 
Identifiable assets*$236,934 $143,889 $167,034 $547,857 
       Capital expenditures$18,812 $8,939 $761 $28,512 
* Unallocated assets not included, consisting primarily of cash and cash equivalents, prepaid expenses, and non-qualified deferred compensation plan assets of $28.2 million at March 31, 2024, $26.0 million at April 2, 2023 and $19.5 million at April 3, 2022