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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 29, 2019 | Dec. 30, 2018 | Dec. 29, 2019 | Dec. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 120,406 | $ 128,151 | $ 407,785 | $ 423,275
Gross profit | 21,478 | 21,033 | 78,269 | 75,262
Selling, general, and administrative expenses | 14,702 | 14,312 | 44,355 | 44,232
Operating income | 6,776 | 6,721 | 33,914 | 31,030
Industrial [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 63,018 | 69,026 | 206,433 | 212,446
Gross profit | 8,418 | 8,288 | 30,007 | 27,059
Selling, general, and administrative expenses | 6,050 | 5,589 | 18,041 | 16,866
Operating income | 2,368 | 2,699 | 11,966 | 10,193
Water Treatment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 34,890 | 32,740 | 124,010 | 116,322
Gross profit | 8,362 | 7,643 | 33,206 | 30,790
Selling, general, and administrative expenses | 4,834 | 4,582 | 14,956 | 14,738
Operating income | 3,528 | 3,061 | 18,250 | 16,052
Health and Nutrition [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 22,498 | 26,385 | 77,342 | 94,507
Gross profit | 4,698 | 5,102 | 15,056 | 17,413
Selling, general, and administrative expenses | 3,818 | 4,141 | 11,358 | 12,628
Operating income | $ 880 | $ 961 | $ 3,698 | $ 4,785

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