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Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) - USD ($) $ in Thousands | Jul. 30, 2017 | Apr. 30, 2017 | Jul. 31, 2016
--- | --- | --- | ---
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment |  | $ 52,912 | $ 51,651 | [1] | $ 41,745
United States [Member] | Mattress Fabrics [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment |  | 35,800 | 34,000 |  | 25,500
United States [Member] | Upholstery Fabrics [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment |  | 1,200 | 1,200 |  | 847
Canada [Member] | Mattress Fabrics [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment |  | 14,500 | 14,900 |  | 13,900
China [Member] | Upholstery Fabrics [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment |  | 684 | 655 |  | 612
Unallocated Corporate [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment | [2] | 785 | 856 |  | 851
Unallocated Corporate [Member] | United States [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Property, plant and equipment |  | $ 785 | $ 856 |  | $ 851
[1] | Derived from audited financial statements.
[2] | The $785, $851, and $856 at July 30, 2017, July 31, 2016 and April 30, 2017, respectively, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments. Property, plant, and equipment associated with corporate are 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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