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Long-Term Debt and Lines of Credit - Long-Term Debt - Narrative (Detail) (USD $) | 12 Months Ended |
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Apr. 27, 2014 | Apr. 28, 2013 | Apr. 29, 2012 | Apr. 27, 2014 Unsecured senior term notes [Member] | Aug. 11, 2008 Unsecured senior term notes [Member]
Debt Instrument [Line Items] |  |  |  |  |
Issuance of unsecured term notes |  |  |  |  | $ 11,000,000
Fixed interest rate |  |  |  |  | 8.01%
Term of the note agreement |  |  |  | 7 years |
Required amount of principal payment installments |  |  |  | 2,200,000 |
Date of first required principal payment |  |  |  | Aug. 11, 2011 |
Required debt payment frequency |  |  |  | Annual |
Average term period for remaining principal payments, in years |  |  |  | 1 year 3 months 18 days |
Maturity date |  |  |  | Aug. 11, 2015 |
Principal payment requirements of long-term debt for the first year | 2,200,000 |  |  |  |
Principal payment requirements of long-term debt for the second year | 2,200,000 |  |  |  |
Interest paid | $ 466,000 | $ 666,000 | $ 817,000 |  |

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- Definition Description of the frequency of periodic payments (monthly, quarterly, annual). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22) -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 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 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 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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