Segment Information - Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 29, 2017	Jan. 31, 2016	Jan. 29, 2017	Jan. 31, 2016
Segment Reporting Information [Line Items]
Net sales	$ 76,169	$ 78,466	$ 232,194	$ 235,607
Gross profit	16,759	16,563	52,079	48,498
Selling, general, and administrative expenses	9,824	9,337	29,171	27,512
income from operations	6,935	7,226	22,908	20,986
Interest income	124	38	164	150
Other expense	(69)	(85)	(376)	(405)
Income before income taxes	6,990	7,179	22,696	20,731
Operating Segments [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	7,292	6,916	21,271	20,237
income from operations	9,467	9,647	30,808	28,261
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	45,920	44,277	141,977	137,522
Gross profit	9,758	8,751	32,414	28,133
Selling, general, and administrative expenses	3,391	2,953	10,185	8,865
income from operations	6,367	5,798	22,229	19,267
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	30,249	34,189	90,217	98,085
Gross profit	7,001	7,812	19,665	20,365
Selling, general, and administrative expenses	3,901	3,963	11,086	11,372
income from operations	3,100	3,849	8,579	8,994
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	2,532	2,421	7,900	7,275
income from operations	$ (2,532)	$ (2,421)	$ (7,900)	$ (7,275)

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

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 940
-SubTopic 20
-Section 25
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953

Reference 2: 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(10))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(15))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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-Name Accounting Standards Codification
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-Section S99
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-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

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Amount before accretion (amortization) of purchase discount (premium) of interest income on nonoperating securities.

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The net result for the period of deducting operating expenses from operating revenues.

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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

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 30
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