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Segment Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jul. 02, 2017 | Apr. 02, 2017 | Jan. 01, 2017 | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 01, 2018 | Apr. 02, 2017 | Apr. 03, 2016
Summary of Segment Information |  |  |  |  |  |  |  |  |  |  |  |
Sales |  | $ 126,990 | $ 118,053 | $ 125,395 | $ 133,731 | $ 118,618 | $ 112,351 | $ 121,250 | $ 131,374 | $ 504,169 | $ 483,593 | $ 413,976
Gross profit |  | 17,806 | 18,840 | 24,115 | 25,999 | 21,913 | 20,912 | 27,032 | 28,216 | 86,760 | 98,073 | 80,257
Selling, general, and administrative expenses |  | 14,670 | 14,139 | 14,828 | 15,766 | 14,468 | 14,916 | 14,871 | 15,126 | 59,403 | 59,381 | 49,086
Goodwill impairment |  | 39,116 | 0 | 0 | 0 |  |  |  |  | 39,116 | 0 | 0
Operating (loss) income |  | (35,980) | $ 4,701 | $ 9,287 | $ 10,233 | 7,445 | $ 5,996 | $ 12,161 | $ 13,090 | (11,759) | 38,692 | 31,171
Identifiable assets | [1] | 376,688 |  |  |  | 404,524 |  |  |  | 376,688 | 404,524 | 403,967
Capital Expenditures |  |  |  |  |  |  |  |  |  | 19,703 | 21,616 | 24,183
Industrial [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Segment Information |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 247,374 | 238,555 | 251,749
Gross profit |  |  |  |  |  |  |  |  |  | 29,619 | 38,886 | 37,967
Selling, general, and administrative expenses |  |  |  |  |  |  |  |  |  | 21,159 | 21,818 | 22,137
Goodwill impairment |  |  |  |  |  |  |  |  |  | 0 |  |
Operating (loss) income |  |  |  |  |  |  |  |  |  | 8,460 | 17,068 | 15,830
Identifiable assets | [1] | 165,052 |  |  |  | 159,032 |  |  |  | 165,052 | 159,032 | 158,015
Capital Expenditures |  |  |  |  |  |  |  |  |  | 10,265 | 10,529 | 17,712
Water Treatment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Segment Information |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 138,465 | 128,954 | 128,312
Gross profit |  |  |  |  |  |  |  |  |  | 36,268 | 35,962 | 35,470
Selling, general, and administrative expenses |  |  |  |  |  |  |  |  |  | 19,426 | 19,798 | 19,261
Goodwill impairment |  |  |  |  |  |  |  |  |  | 0 |  |
Operating (loss) income |  |  |  |  |  |  |  |  |  | 16,842 | 16,164 | 16,209
Identifiable assets | [1] | 58,513 |  |  |  | 53,445 |  |  |  | 58,513 | 53,445 | 50,013
Capital Expenditures |  |  |  |  |  |  |  |  |  | 7,228 | 7,777 | 6,306
Health and Nutrition [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Segment Information |  |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  |  | 118,330 | 116,084 | 33,915
Gross profit |  |  |  |  |  |  |  |  |  | 20,873 | 23,225 | 6,820
Selling, general, and administrative expenses |  |  |  |  |  |  |  |  |  | 18,818 | 17,765 | 7,688
Goodwill impairment |  |  |  |  |  |  |  |  |  | 39,116 |  |
Operating (loss) income |  |  |  |  |  |  |  |  |  | (37,061) | 5,460 | (868)
Identifiable assets | [1] | 153,123 |  |  |  | 192,047 |  |  |  | 153,123 | 192,047 | 195,939
Capital Expenditures |  |  |  |  |  |  |  |  |  | 2,210 | 3,310 | 165
Unallocated Amount to Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of Segment Information |  |  |  |  |  |  |  |  |  |  |  |
Identifiable assets |  | $ 14,300 |  |  |  | $ 13,100 |  |  |  | $ 14,300 | $ 13,100 | $ 32,800
[1] | Unallocated assets, consisting primarily of cash and cash equivalents, investments and prepaid expenses, were $14.3 million at April 1, 2018, $13.1 million at April 2, 2017 and $32.8 million at April 3, 2016.

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