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General and Summary of Significant Accounting Policies (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Apr. 28, 2013 | Apr. 29, 2012 | May 01, 2011 | May 02, 2010
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
cash and cash equivalents | $ 23,530,000 | $ 25,023,000 | $ 23,181,000 | $ 18,295,000
Unrealized gains on short-term bond funds | 54,000 | 16,000 |  |
Short-term bond funds at fair value | 5,300,000 | 5,100,000 |  |
short-term investments | 5,286,000 | 5,941,000 |  |
Inventory aging categories | Inventory aging categories are six, nine, twelve, and fifteen months. |  |  |
Interest costs |  |  | 17,000 |
Foreign currency exchange gain (loss) | (222,000) | 215,000 | 115,000 |
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 | 3,200,000 | 2,600,000 | 2,400,000 |
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 | 10,200,000 | 15,600,000 |  |
short-term investments |  | 796,000 |  |
Foreign currency exchange gain (loss) | (158,000) | 320,000 | 222,000 |
Subsidiaries [Member] | Canada [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
cash and cash equivalents | 5,000,000 | 5,600,000 |  |
short-term investments | 4,200,000 | 4,100,000 |  |
Foreign currency exchange gain (loss) | (10,000) | (19,000) | (24,000) |
Subsidiaries [Member] | Poland [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
cash and cash equivalents | 100,000 | 158,000 |  |
Foreign currency exchange gain (loss) | $ (40,000) | $ (145,000) | $ 26,000 |

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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 investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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