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Segment Information - Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 30, 2017 | Jul. 31, 2016
Segment Reporting Information [Line Items] |  |
Net sales | $ 79,533 | $ 80,682
Gross profit | 16,465 | 18,419
Selling, general, and administrative expenses | 9,501 | 9,746
Income from operations | 6,964 | 8,673
Interest income | 131 | 25
Other expense | (353) | (152)
Income before income taxes | 6,742 | 8,546
Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Selling, general, and administrative expenses | 7,202 | 7,033
Income from operations | 9,263 | 11,386
Operating Segments [Member] | Upholstery Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 31,104 | 30,152
Gross profit | 6,705 | 6,518
Selling, general, and administrative expenses | 3,811 | 3,534
Income from operations | 2,895 | 2,984
Operating Segments [Member] | Mattress Fabrics [Member] |  |
Segment Reporting Information [Line Items] |  |
Net sales | 48,429 | 50,530
Gross profit | 9,760 | 11,901
Selling, general, and administrative expenses | 3,391 | 3,499
Income from operations | 6,368 | 8,402
Unallocated Corporate [Member] |  |
Segment Reporting Information [Line Items] |  |
Selling, general, and administrative expenses | 2,299 | 2,713
Income from operations | $ (2,299) | $ (2,713)

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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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- Definition Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(1)(i)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities. + 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 210.5-03.7(b)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + 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) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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- Definition The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc. + 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 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68048583&loc=d3e3636-108311 + Details
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