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Segment Information - Statement of Operations for Operating Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 29, 2018 | Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | Apr. 29, 2018 | Apr. 30, 2017 | May 01, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
net sales | $ 78,184 | $ 85,310 | $ 80,698 | $ 79,533 | $ 77,350 | $ 76,169 | $ 75,343 | $ 80,682 | $ 323,725 | $ 309,544 | $ 312,860
gross profit | 14,760 | 17,603 | 15,804 | 16,465 | 17,156 | 16,759 | 16,901 | 18,419 | 64,633 | 69,235 | 65,111
selling, general, and administrative expenses | 8,296 | 9,959 | 9,415 | 9,501 | 9,986 | 9,824 | 9,602 | 9,746 | 37,172 | 39,157 | 36,773
income from operations | 6,464 | 7,644 | 6,389 | 6,964 | 7,170 | 6,935 | 7,299 | 8,673 | 27,461 | 30,078 | 28,338
interest expense | (26) | (31) | (37) |  |  |  |  |  | (94) |  |
interest income | 143 | 132 | 128 | 131 | 134 | 124 | 15 | 25 | 534 | 299 | 176
other expense | (115) | (229) | (321) | (353) | (305) | (69) | (155) | (152) | (1,018) | (681) | (616)
income before income taxes | $ 6,466 | $ 7,516 | $ 6,159 | $ 6,742 | $ 6,999 | $ 6,990 | $ 7,159 | $ 8,546 | 26,883 | 29,696 | 27,898
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
income from operations |  |  |  |  |  |  |  |  | 36,817 | 40,471 | 37,794
Operating Segments [Member] | Upholstery Fabrics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
net sales |  |  |  |  |  |  |  |  | 131,128 | 118,739 | 126,441
gross profit |  |  |  |  |  |  |  |  | 25,836 | 26,170 | 26,393
selling, general, and administrative expenses |  |  |  |  |  |  |  |  | 14,881 | 15,079 | 15,094
income from operations |  |  |  |  |  |  |  |  | 10,956 | 11,091 | 11,298
Operating Segments [Member] | Mattress Fabrics [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
net sales |  |  |  |  |  |  |  |  | 192,597 | 190,805 | 186,419
gross profit |  |  |  |  |  |  |  |  | 38,797 | 43,065 | 38,718
selling, general, and administrative expenses |  |  |  |  |  |  |  |  | 12,935 | 13,685 | 12,223
income from operations |  |  |  |  |  |  |  |  | 25,861 | 29,380 | 26,496
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
selling, general, and administrative expenses |  |  |  |  |  |  |  |  | 9,356 | 10,393 | 9,456
income from operations |  |  |  |  |  |  |  |  | $ (9,356) | $ (10,393) | $ (9,456)

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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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