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Segment Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Sep. 28, 2025
Jun. 29, 2025
Sep. 29, 2024
Jun. 30, 2024
Sep. 28, 2025
Sep. 29, 2024
Mar. 30, 2025
Segment Reporting Information [Line Items]              
Sales $ 280,434,000   $ 247,029,000   $ 573,706,000 $ 502,908,000  
Cost of sales - materials 187,098,000   162,623,000   384,919,000 332,108,000  
Cost of sales - operational overhead 25,693,000   24,184,000   48,782,000 45,923,000  
Gross Profit 67,643,000   60,222,000   140,005,000 124,877,000  
Selling, General and Administrative Expense 33,703,000   26,477,000   64,732,000 51,341,000  
Operating Income (Loss) 33,940,000   33,745,000   75,273,000 73,536,000  
Interest expense, net (3,832,000)   (1,427,000)   (7,101,000) (2,690,000)  
Other income 721,000   673,000   1,663,000 832,000  
Income Tax Expense (Benefit) (8,231,000)   (8,873,000)   (18,062,000) (18,681,000)  
Net Income (Loss) 22,598,000 $ 29,175,000 24,118,000 $ 28,879,000 51,773,000 52,997,000  
Identifiable assets* 952,064,000   661,747,000   952,064,000 661,747,000  
Capital expenditures 10,798,000   10,637,000   24,342,000 21,286,000  
Depreciation and amortization 13,262,000   9,927,000   25,553,000 19,256,000  
Assets 984,164,000       984,164,000   $ 769,867,000
Water Treatment [Member]              
Segment Reporting Information [Line Items]              
Sales 150,908,000   124,528,000   300,474,000 241,704,000  
Cost of sales - materials 88,814,000   71,264,000   177,973,000 137,261,000  
Cost of sales - operational overhead 18,833,000   17,336,000   35,493,000 33,307,000  
Gross Profit 43,261,000   35,928,000   87,008,000 71,136,000  
Selling, General and Administrative Expense 22,071,000   15,825,000   41,156,000 29,904,000  
Operating Income (Loss) 21,190,000   20,103,000   45,852,000 41,232,000  
Identifiable assets* 569,338,000   292,017,000   569,338,000 292,017,000  
Capital expenditures 7,033,000   5,428,000   14,593,000 11,549,000  
Depreciation and amortization 7,854,000   4,693,000   14,758,000 8,864,000  
Food & Health Sciences              
Segment Reporting Information [Line Items]              
Sales 72,914,000   71,402,000   162,091,000 156,495,000  
Cost of sales - materials 53,153,000   51,054,000   118,967,000 112,601,000  
Cost of sales - operational overhead 4,280,000   4,283,000   8,295,000 7,926,000  
Gross Profit 15,481,000   16,065,000   34,829,000 35,968,000  
Selling, General and Administrative Expense 8,084,000   7,456,000   16,465,000 14,821,000  
Operating Income (Loss) 7,397,000   8,609,000   18,364,000 21,147,000  
Identifiable assets* 247,644,000   239,639,000   247,644,000 239,639,000  
Capital expenditures 1,774,000   2,421,000   4,787,000 4,582,000  
Depreciation and amortization 3,214,000   3,122,000   6,414,000 6,211,000  
Industrial Solutions [Member]              
Segment Reporting Information [Line Items]              
Sales 56,612,000   51,099,000   111,141,000 104,709,000  
Cost of sales - materials 45,131,000   40,305,000   87,979,000 82,246,000  
Cost of sales - operational overhead 2,580,000   2,565,000   4,994,000 4,690,000  
Gross Profit 8,901,000   8,229,000   18,168,000 17,773,000  
Selling, General and Administrative Expense 3,548,000   3,196,000   7,111,000 6,616,000  
Operating Income (Loss) 5,353,000   5,033,000   11,057,000 11,157,000  
Identifiable assets* 135,082,000   130,091,000   135,082,000 130,091,000  
Capital expenditures 1,991,000   2,788,000   4,962,000 5,155,000  
Depreciation and amortization 2,194,000   2,112,000   4,381,000 4,181,000  
Unallocated              
Segment Reporting Information [Line Items]              
Assets $ 32,100,000   $ 28,000,000   $ 32,100,000 $ 28,000,000