Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 26, 2021	Dec. 27, 2020
Segment Reporting Information [Line Items]
Sales	$ 187,050	$ 142,927	$ 551,568	$ 433,900
Gross profit	33,940	28,239	110,201	92,012
Selling, general, and administrative expenses	19,681	17,750	54,216	49,009
Operating income	14,259	10,489	55,985	43,003
Industrial [Member]
Segment Reporting Information [Line Items]
Sales	100,554	64,356	269,572	197,029
Gross profit	15,303	9,207	42,121	32,100
Selling, general, and administrative expenses	7,367	6,978	20,064	19,474
Operating income	7,936	2,229	22,057	12,626
Water Treatment [Member]
Segment Reporting Information [Line Items]
Sales	49,756	39,298	168,105	128,552
Gross profit	11,103	10,027	44,855	35,888
Selling, general, and administrative expenses	8,254	6,788	22,721	17,654
Operating income	2,849	3,239	22,134	18,234
Health and Nutrition [Member]
Segment Reporting Information [Line Items]
Sales	36,740	39,273	113,891	108,319
Gross profit	7,534	9,005	23,225	24,024
Selling, general, and administrative expenses	4,060	3,984	11,431	11,881
Operating income	$ 3,474	$ 5,021	$ 11,794	$ 12,143