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Investments (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Jul. 26, 2014 | Jul. 27, 2013 | Apr. 26, 2014
Summary of investments |  |  |
Gross Unrealized Gains | $ 1,747,000 |  | $ 1,413,000
Gross Unrealized Losses | (100,000) |  | (106,000)
Fair Value | 60,770,000 |  | 60,938,000
Sales of available-for-sale securities |  |  |
Proceeds from sales | 10,422,000 | 8,558,000 |
Gross realized gains | 14,000 | 13,000 |
Gross realized losses | (8,000) | (36,000) |
Fair value of available-for-sale securities by contractual maturity |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 16,700,000 |  |
Fair value, available-for-sale securities with contractual maturity within two to five years | 31,800,000 |  |
Fair value, available-for-sale securities with contractual maturity within six to ten years | 1,900,000 |  |
Fair value, available-for-sale securities with contractual maturity after ten years | 500,000 |  |
Investments Used to Enhance Returns on Cash [Member] |  |  |
Summary of investments |  |  |
Fair Value | 45,200,000 |  | 44,700,000
Other Current Assets [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale investments | 16,700,000 |  | 15,900,000
Trading securities | 1,000,000 |  | 1,800,000
Other Noncurrent Assets [Member] |  |  |
Investment Holdings [Line Items] |  |  |
Available-for-sale investments | 43,100,000 |  | 43,200,000
Equity Securities [Member] |  |  |
Summary of investments |  |  |
Gross Unrealized Gains | 1,565,000 |  | 1,246,000
Gross Unrealized Losses | (45,000) |  | (52,000)
Fair Value | 8,574,000 |  | 8,216,000
Fixed Income Securities [Member] |  |  |
Summary of investments |  |  |
Gross Unrealized Gains | 181,000 |  | 166,000
Gross Unrealized Losses | (40,000) |  | (44,000)
Fair Value | 50,925,000 |  | 50,510,000
Asset-backed Securities [Member] |  |  |
Summary of investments |  |  |
Fair Value | 1,017,000 |  | 1,787,000
Other Debt Obligations [Member] |  |  |
Summary of investments |  |  |
Gross Unrealized Gains | 1,000 |  | 1,000
Gross Unrealized Losses | (15,000) |  | (10,000)
Fair Value | $ 254,000 |  | $ 425,000

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