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Marketable Securities (Tables) | 9 Months Ended
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Jan. 26, 2013
Marketable Securities [Abstract] |
Available-for-sale Securities | As of January 26, 2013 and April 28, 2012, our available-for-sale securities consisted of the following:
| Amortized Cost |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Balance as of January 26, 2013: |  |  |  |  |  |  |
Certificates of deposit | $ | 7,155 |  |  | $ | 2 |  |  | $ | — |  |  | $ | 7,157 |
U.S. Government securities | 5,998 |  |  | 20 |  |  | — |  |  | 6,018 |
U.S. Government sponsored entities | 4,753 |  |  | — |  |  | (7 | ) |  | 4,746 |
Municipal obligations | 7,606 |  |  | 12 |  |  | — |  |  | 7,618 |
| $ | 25,512 |  |  | $ | 34 |  |  | $ | (7 | ) |  | $ | 25,539 |
Balance as of April 28, 2012: |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit | $ | 7,657 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,657 |
U.S. Government securities | 7,507 |  |  | 49 |  |  | — |  |  | 7,556 |
U.S. Government sponsored entities | 4,503 |  |  | 2 |  |  | — |  |  | 4,505 |
Municipal obligations | 5,517 |  |  | 23 |  |  | — |  |  | 5,540 |
| $ | 25,184 |  |  | $ | 74 |  |  | $ | — |  |  | $ | 25,258 |
Investments Classified by Contractual Maturity Date | All available-for-sale securities are classified as current assets, as they are readily available to support our current operating needs. The contractual maturities of available-for-sale debt securities as of January 26, 2013 were as follows:
| Less than 12 months |  | Greater than 12 months |  | Total
Certificates of deposit | $ | 4,199 |  |  | $ | 2,958 |  |  | $ | 7,157 |
U.S. Government securities | 3,011 |  |  | 3,007 |  |  | 6,018 |
U.S. Government sponsored entities | — |  |  | 4,746 |  |  | 4,746 |
Municipal obligations | 2,542 |  |  | 5,076 |  |  | 7,618 |
| $ | 9,752 |  |  | $ | 15,787 |  |  | $ | 25,539 |

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- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-1 -Paragraph 21 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 17 -Subparagraph a, b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27337-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 19, 20, 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 + Details
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