Segment Information - Narrative (Detail)	12 Months Ended
May 03, 2020 Segment Customer	Apr. 28, 2019 Customer	Apr. 29, 2018 Customer
Segment Reporting Information [Line Items]
Number of operating 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 expired on February 1, 2020. However, the provisions of this collective bargaining agreement remained in effect as negotiations for a new collective bargaining agreement were delayed due to government mandated shutdowns in response to the COVID-19 pandemic. A new collective bargaining agreement is expected to be executed during the first half of fiscal 2021. We are not aware of any efforts to organize any more of our employees, and we believe our relations with our employees are good.
Description of changes in reporting goodwill and intangible assets in segment assets	During fiscal 2019, we elected to no longer include goodwill and intangible assets in segment assets, as these assets are not used by the Chief Operating Decision Maker to evaluate the respective segment’s operating performance, to allocate resources to the individual segments, or determine executive compensation.
Workforce [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	12.00%
Currency Concentration Risk [Member] \| Net Sales [Member] \| USD [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	93.00%	90.00%	90.00%
Geographic Concentration Risk [Member] \| Net Sales [Member] \| International [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	26.00%	26.00%	23.00%
Customer Concentration Risk [Member] \| Net Sales [Member] \| Upholstery Fabrics [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	12.00%	11.00%	12.00%
Number of major customers	1	1	1
Customer Concentration Risk [Member] \| Net Sales [Member] \| Mattress Fabrics [Member] \| Minimum [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	10.00%	10.00%	13.00%
Number of major customers	0	0	1
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Upholstery Fabrics [Member] \| Minimum [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	10.00%	10.00%
Number of major customers	0	0
Customer Concentration Risk [Member] \| Accounts Receivable [Member] \| Mattress Fabrics [Member]
Segment Reporting Information [Line Items]
Concentration risk percentage	10.00%	10.00%
Number of major customers	0	0

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

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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.

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Disclosure about a restatement of previous periods' segment information resulting from a change in the composition of the entity's reportable segments.

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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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