Fair Value (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands	Jul. 30, 2011
Company's assets measured at fair value
Money market funds	$ 161,614
ARS - available-for-sale - student loan backed	86,318
ARS - available-for-sale - municipal authority bonds	15,605
Municipal notes and bonds held in the Rabbi Trust	11,690
Derivative financial instruments	819
Total assets measured at fair value	276,046
Derivative financial instruments	1,863
Total liabilities measured at fair value	1,863
Level 1 [Member]
Company's assets measured at fair value
Money market funds	161,614
ARS - available-for-sale - student loan backed	0
ARS - available-for-sale - municipal authority bonds	0
Municipal notes and bonds held in the Rabbi Trust	11,690
Derivative financial instruments	0
Total assets measured at fair value	173,304
Derivative financial instruments	0
Total liabilities measured at fair value	0
Level 2 [Member]
Company's assets measured at fair value
Money market funds	0
ARS - available-for-sale - student loan backed	0
ARS - available-for-sale - municipal authority bonds	0
Municipal notes and bonds held in the Rabbi Trust	0
Derivative financial instruments	819
Total assets measured at fair value	819
Derivative financial instruments	1,863
Total liabilities measured at fair value	1,863
Level 3 [Member]
Company's assets measured at fair value
Money market funds	0
ARS - available-for-sale - student loan backed	86,318
ARS - available-for-sale - municipal authority bonds	15,605
Municipal notes and bonds held in the Rabbi Trust	0
Derivative financial instruments	0
Total assets measured at fair value	101,923
Derivative financial instruments	0
Total liabilities measured at fair value	$ 0

Available for sale Municipal authority bonds Fair value disclosure.

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Period Type:	instant

- Definition

Available for sale Student loan backed Fair value disclosure.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Money market funds fair value disclosure.

+ Details

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- Definition

Municipal Bonds and notes Held in trust fair value disclosure.

+ Details

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- Definition

This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ Details

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13495-108611

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FIN39-1
-Paragraph 10A, 10B
-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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 4, 17
-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 Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13433-108611

+ Details

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- Definition

Fair values as of the balance sheet date of all liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

+ References

+ Details

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- Details

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- Definition

This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

+ Details

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Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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