Segment Information - Financial Information for Operating Segments (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jan. 31, 2016	Feb. 01, 2015	Jan. 31, 2016	Feb. 01, 2015
Segment Reporting Information [Line Items]
Net sales	$ 78,466	$ 81,269	$ 235,607	$ 231,320
Gross profit	16,563	14,402	48,498	39,395
Selling, general, and administrative expenses	9,337	8,375	27,512	23,173
Income from operations	7,226	6,027	20,986	16,222
Interest expense				(50)
Interest income	38	202	150	478
Other expense	(85)	(307)	(405)	(380)
Income before income taxes	7,179	5,922	20,731	16,270
Operating Segments [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	6,916	6,634	20,237	18,537
Income from operations	9,647	7,768	28,261	20,858
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	44,277	45,683	137,522	131,543
Gross profit	8,751	8,076	28,133	22,603
Selling, general, and administrative expenses	2,953	2,853	8,865	8,019
Income from operations	5,798	5,223	19,267	14,584
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	34,189	35,586	98,085	99,777
Gross profit	7,812	6,326	20,365	16,792
Selling, general, and administrative expenses	3,963	3,781	11,372	10,518
Income from operations	3,849	2,545	8,994	6,274
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	2,421	1,741	7,275	4,636
Income from operations	$ (2,421)	$ (1,741)	$ (7,275)	$ (4,636)

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

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This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and 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=51673353&loc=d3e41242-110953

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 10
-Article 5

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Amount of the cost of borrowed funds accounted for as interest expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.9)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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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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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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=26872669&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=51677171&loc=d3e3636-108311

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