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Investments (Details) (USD $)	3 Months Ended		6 Months Ended
	Oct. 26, 2013	Oct. 27, 2012	Oct. 26, 2013	Oct. 27, 2012	Apr. 27, 2013
Schedule of Available-for-sale Securities [Line Items]
Amount of investment which enhance return on cash	$ 30,100,000		$ 30,100,000		$ 29,900,000
Summary of investments [Abstract]
Gross Unrealized Gains	1,459,000		1,459,000		456,000
Gross Unrealized Losses	(110,000)		(110,000)		(156,000)
Fair Value	46,103,000		46,103,000		41,090,000
Sales of available-for-sale securities [Abstract]
Proceeds from sales	9,636,000	3,480,000	18,196,000	4,908,000
Gross realized gains	32,000	621,000	45,000	845,000
Gross realized losses	(29,000)	(10,000)	(65,000)	(36,000)
Available-for-sale fair value by contractual maturity [Abstract]
Available-for-sale securities, within one year, fair value	9,600,000		9,600,000
Available-for-sale Securities, within two through five years, fair value	23,500,000		23,500,000
Available-for-sale securities, within six through ten years, fair value	1,800,000		1,800,000
Available-for-sale securities, after ten years, fair value	500,000		500,000
Other Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments, current	9,600,000		9,600,000		10,800,000
Trading securities, current	1,400,000		1,400,000		1,100,000
Other Long-Term Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale investments	35,100,000		35,100,000		29,200,000
Equity Securities [Member]
Summary of investments [Abstract]
Gross Unrealized Gains	1,303,000		1,303,000		296,000
Gross Unrealized Losses	(67,000)		(67,000)		(152,000)
Fair Value	8,975,000		8,975,000		6,668,000
Fixed Income [Member]
Summary of investments [Abstract]
Gross Unrealized Gains	155,000		155,000		159,000
Gross Unrealized Losses	(35,000)		(35,000)		(1,000)
Fair Value	35,396,000		35,396,000		33,076,000
Mutual Funds [Member]
Summary of investments [Abstract]
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	0		0		0
Fair Value	1,439,000		1,439,000		1,126,000
Other [Member]
Summary of investments [Abstract]
Gross Unrealized Gains	1,000		1,000		1,000
Gross Unrealized Losses	(8,000)		(8,000)		(3,000)
Fair Value	$ 293,000		$ 293,000		$ 220,000

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- Definition

Financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time, usually less than one year or the normal operating cycle, whichever is longer) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: 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 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 29

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Implementation Guide (Q and A)

-Number FAS115

-Paragraph 35

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Trading Securities

-URI http://asc.fasb.org/extlink&oid=6526789

+ Details

Name:	us-gaap_TradingSecuritiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant