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Investments (Details) (USD $)	3 Months Ended		9 Months Ended
Investments (Details) (USD $)	Jan. 24, 2015	Jan. 25, 2014	Jan. 24, 2015	Jan. 25, 2014	Apr. 26, 2014
Summary of investments
Gross Unrealized Gains	$ 1,755,000		$ 1,755,000		$ 1,413,000
Gross Unrealized Losses	(201,000)		(201,000)		(106,000)
Fair Value	60,445,000us-gaap_MarketableSecurities		60,445,000us-gaap_MarketableSecurities		60,938,000us-gaap_MarketableSecurities
Sales of available-for-sale securities
Proceeds from sales	6,160,000	9,778,000	23,987,000	27,974,000
Gross realized gains	209,000	775,000	254,000	820,000
Gross realized losses	(23,000)	(473,000)	(53,000)	(538,000)
Fair value of available-for-sale securities by contractual maturity
Fair value, available-for-sale securities with contractual maturity within one year	18,900,000		18,900,000
Fair value, available-for-sale securities with contractual maturity within two to five years	29,600,000		29,600,000
Fair value, available-for-sale securities with contractual maturity within six to ten years	1,500,000		1,500,000
Fair value, available-for-sale securities with contractual maturity after ten years	500,000		500,000
Investments Used to Enhance Returns on Cash
Summary of investments
Fair Value	45,300,000		45,300,000		44,700,000
Other Current Assets
Investments
Available-for-sale investments	18,900,000		18,900,000		15,900,000
Trading securities	900,000		900,000		1,800,000
Other Noncurrent Assets
Investments
Available-for-sale investments	40,600,000		40,600,000		43,200,000
Equity Securities
Summary of investments
Gross Unrealized Gains	1,567,000		1,567,000		1,246,000
Gross Unrealized Losses	(109,000)		(109,000)		(52,000)
Fair Value	8,740,000		8,740,000		8,216,000
Fixed Income Securities
Summary of investments
Gross Unrealized Gains	187,000		187,000		166,000
Gross Unrealized Losses	(72,000)		(72,000)		(44,000)
Fair Value	50,466,000		50,466,000		50,510,000
Asset-backed Securities
Summary of investments
Fair Value	875,000		875,000		1,787,000
Other Debt Obligations
Summary of investments
Gross Unrealized Gains	1,000		1,000		1,000
Gross Unrealized Losses	(20,000)		(20,000)		(10,000)
Fair Value	$ 364,000		$ 364,000		$ 425,000