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)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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+ 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

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No definition available.

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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.

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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

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