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General and Summary of Significant Accounting Policies (Detail) | 12 Months Ended |
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May. 03, 2015 USD ($) Segment | Apr. 27, 2014 USD ($) | Apr. 28, 2013 USD ($) | Apr. 29, 2012 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Number of business segments | Segment | 2 |  |  |
Accumulated unrealized (loss) gain on short-term investments | $ (95,000) | $ (60,000) |  |
short-term investments | 10,004,000 | 6,294,000 |  |
Long-term investments at fair value | $ 2,415,000 | 765,000 |  |
Inventory aging categories | Inventory aging categories are six, nine, twelve, and fifteen months |  |  |
Interest costs | $ 171,000 | 0 | $ 0 |
goodwill | 11,462,000 | 11,462,000 | 11,462,000 | $ 11,462,000
Selling, general and administrative expenses [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Handling costs | $ 3,800,000 | 3,500,000 | $ 3,200,000 |
Minimum [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
Short-term investments, maturity period | 3 months |  |  |
Mattress Fabrics [Member] |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |
goodwill | $ 11,500,000 | $ 11,500,000 |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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