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Investments (Details) (USD $) | 12 Months Ended
--- | ---
Apr. 26, 2014 | Apr. 27, 2013 | Apr. 28, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amount of investment which enhance return on cash | $ 44,700,000 | $ 29,900,000 |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 1,413,000 | 456,000 |
Gross Unrealized Losses | (106,000) | (156,000) |
Fair Value | 60,938,000 | 41,090,000 |
Sales of available-for-sale securities [Abstract] |  |  |
Proceeds from sales | 34,557,000 | 18,662,000 | 8,649,000
Gross realized gains | 857,000 | 4,486,000 | 573,000
Gross realized losses | (559,000) | (1,316,000) | (54,000)
Available-for-sale fair value by contractual maturity [Abstract] |  |  |
Available-for-sale securities, within one year, fair value | 15,900,000 |  |
Available-for-sale Securities, within two through five years, fair value | 32,700,000 |  |
Available-for-sale securities, within six through ten years, fair value | 1,400,000 |  |
Available-for-sale securities, after ten years, fair value | 500,000 |  |
Other Current Assets [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale investments, current | 15,900,000 | 10,800,000 |
Trading securities, current | 1,800,000 | 1,100,000 |
Other Long-Term Assets [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Available-for-sale investments | 43,200,000 | 29,200,000 |
Equity securities [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 1,246,000 | 296,000 |
Gross Unrealized Losses | (52,000) | (152,000) |
Fair Value | 8,216,000 | 6,668,000 |
Fixed income [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 166,000 | 159,000 |
Gross Unrealized Losses | (44,000) | (1,000) |
Fair Value | 50,510,000 | 33,076,000 |
Mutual funds [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 1,787,000 | 1,126,000 |
Other [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 1,000 | 1,000 |
Gross Unrealized Losses | (10,000) | (3,000) |
Fair Value | $ 425,000 | $ 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 Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 2: 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 + Details
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