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Investments (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 27, 2013 | Jul. 28, 2012 | Apr. 27, 2013
Schedule of Investments [Line Items] |  |  |
Amount of investment which enhance return on cash | $ 27,800,000 |  | $ 29,900,000
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 932,000 |  | 456,000
Gross Unrealized Losses | (189,000) |  | (156,000)
Fair Value | 39,936,000 |  | 41,090,000
Sales of available-for-sale securities [Abstract] |  |  |
Proceeds from sales | 8,558,000 | 1,428,000 |
Gross realized gains | 13,000 | 224,000 |
Gross realized losses | (36,000) | (26,000) |
Available-for-sale fair value by contractual maturity [Abstract] |  |  |
Available-for-sale securities, within one year, fair value | 5,600,000 |  |
Available-for-sale Securities, within two through five years, fair value | 23,800,000 |  |
Available-for-sale securities, within six through ten years, fair value | 600,000 |  |
Available-for-sale securities, after ten years, fair value | 500,000 |  |
Other Current Assets [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale investments, current | 5,600,000 |  | 10,800,000
Trading securities, current | 2,000,000 |  | 1,100,000
Other Long-Term Assets [Member] |  |  |
Schedule of Investments [Line Items] |  |  |
Available-for-sale investments | 32,300,000 |  | 29,200,000
Equity Securities [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 834,000 |  | 296,000
Gross Unrealized Losses | (113,000) |  | (152,000)
Fair Value | 7,247,000 |  | 6,668,000
Fixed Income [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 97,000 |  | 159,000
Gross Unrealized Losses | (70,000) |  | (1,000)
Fair Value | 30,460,000 |  | 33,076,000
Mutual Funds [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | 0 |  | 0
Fair Value | 1,983,000 |  | 1,126,000
Other [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross Unrealized Gains | 1,000 |  | 1,000
Gross Unrealized Losses | (6,000) |  | (3,000)
Fair Value | $ 246,000 |  | $ 220,000

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