Segment Information - Financial Information for Operating Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 01, 2015	Jan. 26, 2014	Feb. 01, 2015	Jan. 26, 2014
Segment Reporting Information [Line Items]
Net sales	$ 81,269us-gaap_SalesRevenueNet	$ 72,389us-gaap_SalesRevenueNet	$ 231,320us-gaap_SalesRevenueNet	$ 213,119us-gaap_SalesRevenueNet
Gross profit	14,402us-gaap_GrossProfit	11,837us-gaap_GrossProfit	39,395us-gaap_GrossProfit	37,145us-gaap_GrossProfit
Selling, general, and administrative expenses	8,375	7,041	23,173	21,340
Income from operations	6,027us-gaap_OperatingIncomeLoss	4,796us-gaap_OperatingIncomeLoss	16,222us-gaap_OperatingIncomeLoss	15,805us-gaap_OperatingIncomeLoss
Interest expense		(91)us-gaap_InterestExpense	(50)us-gaap_InterestExpense	(330)us-gaap_InterestExpense
Interest income	202us-gaap_InvestmentIncomeInterest	148us-gaap_InvestmentIncomeInterest	478us-gaap_InvestmentIncomeInterest	343us-gaap_InvestmentIncomeInterest
Other expense	(307)us-gaap_OtherNonoperatingIncomeExpense	(279)us-gaap_OtherNonoperatingIncomeExpense	(380)us-gaap_OtherNonoperatingIncomeExpense	(895)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	5,922	4,574	16,270	14,923
Operating Segments [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	6,634	5,858	18,537	17,287
Income from operations	7,768	5,979	20,858	19,858
Operating Segments [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	45,683	38,541	131,543	117,035
Gross profit	8,076	5,599	22,603	20,312
Selling, general, and administrative expenses	2,853	2,286	8,019	7,280
Income from operations	5,223	3,313	14,584	13,033
Operating Segments [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Net sales	35,586	33,848	99,777	96,084
Gross profit	6,326	6,238	16,792	16,833
Selling, general, and administrative expenses	3,781	3,572	10,518	10,007
Income from operations	2,545	2,666	6,274	6,825
Unallocated corporate [Member]
Segment Reporting Information [Line Items]
Selling, general, and administrative expenses	1,741	1,183	4,636	4,053
Income from operations	$ (1,741)	$ (1,183)	$ (4,636)	$ (4,053)

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

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 5

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- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 20

-Section 50

-Paragraph 1

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.9)

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-Name Regulation S-X (SX)

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- Definition

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

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Name Accounting Standards Codification

-Topic 225

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-Paragraph 2

-Subparagraph (SX 210.5-03.7(b))

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- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.9)

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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

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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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

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-Publisher SEC

-Name Regulation S-X (SX)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 330

-SubTopic 10

-Section 30

-Paragraph 8

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