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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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- Definition 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 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592 + Details
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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 + Details
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