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Long-Term Debt and Lines of Credit - Long-Term Debt - Narrative (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Aug. 11, 2015 | May 01, 2016 | May 03, 2015 | Apr. 27, 2014 | Aug. 11, 2008
Debt Instrument [Line Items] |  |  |  |  |
Interest paid |  | $ 95,000 | $ 268,000 | $ 466,000 |
Unsecured 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 |  |  |
Required debt payment frequency |  | Annual |  |  |
Date of first required principal payment |  | Aug. 11, 2011 |  |  |
Last annual payment paid | $ 2,200,000 |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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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 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 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 + 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 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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- Definition Amount of the required periodic payments applied to principal. + References Reference 1: 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 + Details
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