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Investments (Details) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Oct. 26, 2013 | Oct. 27, 2012 | Oct. 26, 2013 | Oct. 27, 2012 | Apr. 27, 2013
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Amount of investment which enhance return on cash | $ 30,100,000 |  | $ 30,100,000 |  | $ 29,900,000
Summary of investments [Abstract] |  |  |  |  |
Gross Unrealized Gains | 1,459,000 |  | 1,459,000 |  | 456,000
Gross Unrealized Losses | (110,000) |  | (110,000) |  | (156,000)
Fair Value | 46,103,000 |  | 46,103,000 |  | 41,090,000
Sales of available-for-sale securities [Abstract] |  |  |  |  |
Proceeds from sales | 9,636,000 | 3,480,000 | 18,196,000 | 4,908,000 |
Gross realized gains | 32,000 | 621,000 | 45,000 | 845,000 |
Gross realized losses | (29,000) | (10,000) | (65,000) | (36,000) |
Available-for-sale fair value by contractual maturity [Abstract] |  |  |  |  |
Available-for-sale securities, within one year, fair value | 9,600,000 |  | 9,600,000 |  |
Available-for-sale Securities, within two through five years, fair value | 23,500,000 |  | 23,500,000 |  |
Available-for-sale securities, within six through ten years, fair value | 1,800,000 |  | 1,800,000 |  |
Available-for-sale securities, after ten years, fair value | 500,000 |  | 500,000 |  |
Other Current Assets [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale investments, current | 9,600,000 |  | 9,600,000 |  | 10,800,000
Trading securities, current | 1,400,000 |  | 1,400,000 |  | 1,100,000
Other Long-Term Assets [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Available-for-sale investments | 35,100,000 |  | 35,100,000 |  | 29,200,000
Equity Securities [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Gross Unrealized Gains | 1,303,000 |  | 1,303,000 |  | 296,000
Gross Unrealized Losses | (67,000) |  | (67,000) |  | (152,000)
Fair Value | 8,975,000 |  | 8,975,000 |  | 6,668,000
Fixed Income [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Gross Unrealized Gains | 155,000 |  | 155,000 |  | 159,000
Gross Unrealized Losses | (35,000) |  | (35,000) |  | (1,000)
Fair Value | 35,396,000 |  | 35,396,000 |  | 33,076,000
Mutual Funds [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Gross Unrealized Gains | 0 |  | 0 |  | 0
Gross Unrealized Losses | 0 |  | 0 |  | 0
Fair Value | 1,439,000 |  | 1,439,000 |  | 1,126,000
Other [Member] |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |
Gross Unrealized Gains | 1,000 |  | 1,000 |  | 1,000
Gross Unrealized Losses | (8,000) |  | (8,000) |  | (3,000)
Fair Value | $ 293,000 |  | $ 293,000 |  | $ 220,000

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- Definition Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 17 -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. + Details
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- Definition Financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -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 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 29 -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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph a -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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS115 -Paragraph 35 -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 -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant