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General and Summary of Significant Accounting Policies (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Apr. 27, 2014 Segment | Apr. 28, 2013 | Apr. 29, 2012 | May 01, 2011
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of business segments | 2 |  |  |
cash and cash equivalents | $ 29,303,000 | $ 23,530,000 | $ 25,023,000 | $ 23,181,000
Accumulated unrealized (loss) gain on short-term investments | (60,000) | 54,000 |  |
short-term investments | 6,294,000 | 5,286,000 |  |
Long-term investments at fair value | 765,000 |  |  |
Inventory aging categories | Inventory aging categories are six, nine, twelve, and fifteen months. |  |  |
Interest costs | 0 | 0 | 0 |
Foreign currency exchange gain (loss) | (626,000) | (222,000) | 215,000 |
goodwill | 11,462,000 | 11,462,000 | 11,462,000 | 11,462,000
Mattress Fabrics [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
goodwill | 11,462,000 | 11,462,000 |  |
Selling, general and administrative expense [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Handling costs | 3,500,000 | 3,200,000 | 2,600,000 |
United States [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
short-term investments | 1,000,000 | 1,000,000 |  |
Subsidiaries [Member] | China [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
cash and cash equivalents | 15,300,000 | 10,200,000 |  |
short-term investments | 0 | 0 |  |
Foreign currency exchange gain (loss) | (571,000) | (158,000) | 320,000 |
Subsidiaries [Member] | Canada [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
cash and cash equivalents | 9,100,000 | 5,000,000 |  |
short-term investments | 5,300,000 | 4,200,000 |  |
Foreign currency exchange gain (loss) | (44,000) | (10,000) | (19,000) |
Subsidiaries [Member] | Poland [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
cash and cash equivalents | 162,000 | 100,000 |  |
short-term investments | 0 | 0 |  |
Foreign currency exchange gain (loss) | $ (50,000) | $ (40,000) | $ (145,000) |

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- Definition Net amount of accumulated unrealized gains (losses) on investments in available-for-sale securities impacting investments. Represents the difference between the fair value and cost of investments in available-for-sale securities. + References No definition available. + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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