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Segment Information - Narrative (Detail)			12 Months Ended
	Apr. 29, 2018 Customer	Apr. 30, 2017 Customer	Apr. 29, 2018 Customer Segment	Apr. 30, 2017 Customer	May 01, 2016 Customer
Segment Reporting Information [Line Items]
Number of business segments | Segment			2
Concentration risk, labor subject to collective bargaining arrangements			The hourly employees at our manufacturing facility in Canada (approximately 12% of our workforce) are represented by a local, unaffiliated union. The collective bargaining agreement for these employees expires on February 1, 2020. We are not aware of any efforts to organize any more of our employees, and we believe our relations with our employees are good.
Currency Concentration Risk [Member] | Net sales [Member] | USD [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage			90.00%	92.00%	93.00%
Geographic Concentration Risk [Member] | Net sales [Member] | International [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage			23.00%	22.00%	22.00%
Customer Concentration Risk [Member] | Net sales [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage			12.00%	11.00%	13.00%
Number of major customers			1	1	1
Customer Concentration Risk [Member] | Net sales [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage			13.00%	13.00%	13.00%
Number of major customers			1	1	1
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	13.00%
Number of major customers	1	0
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Upholstery Fabrics [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage		10.00%
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	20.00%	22.00%
Number of major customers	2	2
Unionized Employees Concentration Risk [Member] | Workforce [Member] | Canada [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage			12.00%

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Description of any concentration of labor subject to collective bargaining agreements, including the general nature of the risk.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 275
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-Section 50
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-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 825
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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