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Investments (Details) (USD $) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 27, 2012 | Oct. 29, 2011 | Oct. 27, 2012 | Oct. 29, 2011 | Apr. 28, 2012
Schedule of Investments [Line Items] |  |  |  |  |
Amount of investment which enhance return on cash | $ 24,800,000 |  | $ 24,800,000 |  |
Gross Unrealized Gains |  |  | 2,117,000 |  | 2,908,000
Gross Unrealized Losses |  |  | (144,000) |  | (90,000)
Fair Value | 35,614,000 |  | 35,614,000 |  | 11,200,000
Sales of Available-for-sale Securities [Abstract] |  |  |  |  |
Proceeds from sales | 3,480,000 | 1,050,000 | 4,908,000 | 3,210,000 |
Gross realized gains | 621,000 | 52,000 | 845,000 | 447,000 |
Gross realized losses | (10,000) | (24,000) | (36,000) | (27,000) |
Available-for-sale fair value by contractual maturity [Abstract] |  |  |  |  |
Available-for-sale securities, after one through five years, fair value | 8,600,000 |  | 8,600,000 |  |
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value | 17,500,000 |  | 17,500,000 |  |
Available-for-sale securities, after five through ten years, fair value | 800,000 |  | 800,000 |  |
Available-for-sale securities, after ten years, fair value | 600,000 |  | 600,000 |  |
Other Long-Term Assets [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Available-for-sale investments | 27,000,000 |  | 27,000,000 |  | 10,200,000
Trading securities |  |  |  |  | 1,000,000
Other Current Assets [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Available-for-sale investments | 8,600,000 |  | 8,600,000 |  |
Equity securities [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Gains |  |  | 1,993,000 |  | 2,806,000
Gross Unrealized Losses |  |  | (134,000) |  | (83,000)
Fair Value | 6,489,000 |  | 6,489,000 |  | 7,237,000
Fixed income [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Gains |  |  | 124,000 |  | 102,000
Gross Unrealized Losses |  |  | (10,000) |  | (7,000)
Fair Value | 27,515,000 |  | 27,515,000 |  | 2,850,000
Mutual funds [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Gains |  |  | 0 |  | 0
Gross Unrealized Losses |  |  | 0 |  | 0
Fair Value | 1,071,000 |  | 1,071,000 |  | 950,000
Other [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Gross Unrealized Gains |  |  | 0 |  | 0
Gross Unrealized Losses |  |  | 0 |  | 0
Fair Value | $ 539,000 |  | $ 539,000 |  | $ 163,000

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