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Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($) $ in Thousands | Apr. 29, 2018 | Jan. 28, 2018 | Oct. 29, 2017 | Jul. 30, 2017 | Apr. 30, 2017 | Jan. 29, 2017 | Oct. 30, 2016 | Jul. 31, 2016 | May 01, 2016
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
property, plant and equipment |  | $ 51,794 | $ 51,838 | $ 52,530 | $ 52,912 | $ 51,651 | $ 50,333 | $ 45,537 | $ 41,745 |
United States [Member] | Mattress Fabrics [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
property, plant and equipment |  | 35,400 |  |  |  | 34,000 |  |  |  | $ 24,800
United States [Member] | Upholstery Fabrics [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
property, plant and equipment |  | 1,800 |  |  |  | 1,200 |  |  |  | 893
Canada [Member] | Mattress Fabrics [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
property, plant and equipment |  | 13,400 |  |  |  | 14,900 |  |  |  | 12,700
China [Member] | Upholstery Fabrics [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
property, plant and equipment |  | 661 |  |  |  | 655 |  |  |  | 671
Unallocated Corporate [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
property, plant and equipment | [1] | 552 |  |  |  | 856 |  |  |  | 929
Unallocated Corporate [Member] | United States [Member] |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |
property, plant and equipment |  | $ 552 |  |  |  | $ 856 |  |  |  | $ 929
[1] | The $552, $856, and $929 balance at April 29, 2018, April 30, 2017, and May 1, 2016, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments located in the U.S.

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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