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Segment Information - Balance Sheet Information by Operating Segments (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 27, 2014 | Jan. 26, 2014 | Oct. 27, 2013 | Jul. 28, 2013 | Apr. 28, 2013 | Jan. 27, 2013 | Oct. 28, 2012 | Jul. 29, 2012 | Apr. 27, 2014 Unallocated corporate [Member] | Apr. 28, 2013 Unallocated corporate [Member] | Apr. 29, 2012 Unallocated corporate [Member] | Apr. 27, 2014 Mattress Fabrics [Member] United States [Member] | Apr. 28, 2013 Mattress Fabrics [Member] United States [Member] | Apr. 29, 2012 Mattress Fabrics [Member] United States [Member] | Apr. 27, 2014 Mattress Fabrics [Member] Canada [Member] | Apr. 28, 2013 Mattress Fabrics [Member] Canada [Member] | Apr. 29, 2012 Mattress Fabrics [Member] Canada [Member] | Apr. 27, 2014 Upholstery Fabrics [Member] United States [Member] | Apr. 28, 2013 Upholstery Fabrics [Member] United States [Member] | Apr. 29, 2012 Upholstery Fabrics [Member] United States [Member] | Apr. 27, 2014 Upholstery Fabrics [Member] China [Member] | Apr. 28, 2013 Upholstery Fabrics [Member] China [Member] | Apr. 29, 2012 Upholstery Fabrics [Member] China [Member] | Apr. 27, 2014 Upholstery Fabrics [Member] Poland [Member] | Apr. 28, 2013 Upholstery Fabrics [Member] Poland [Member] | Apr. 29, 2012 Upholstery Fabrics [Member] Poland [Member]
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Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | $ 31,376 | $ 30,115 | $ 30,559 | $ 30,808 | $ 30,594 | $ 30,055 | $ 30,621 | $ 31,016 | $ 763 | [1] | $ 786 | [1] | $ 918 | [1] | $ 20,600 | $ 20,400 | $ 21,200 | $ 8,400 | $ 8,200 | $ 8,000 | $ 957 | $ 908 | $ 837 | $ 572 | $ 265 | $ 183 | $ 44 | $ 57 | $ 104
[1] | The $763, $786, and $918 balance at April 27, 2014, April 28, 2013, and April 29, 2012, represent property, plant, and equipment associated with unallocated corporate departments and corporate departments shared by both the mattress and upholstery fabric segments.

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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 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 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 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 7 + Details
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