Debt And Money Market Securities (Carrying Value And Fair Market Value Of Debt) (Details) (USD $) In Thousands	Jul. 29, 2011	Jul. 30, 2010
Carrying amount of debt	$ 1,164,834	$ 878,190
Fair market value of debt	1,264,329	979,300
Publicly Traded Debt [Member]
Carrying amount of debt	800,000	800,000
Fair market value of debt	900,927	903,227
Non-Publicly Traded Debt [Member]
Carrying amount of debt	364,834	78,190
Fair market value of debt	$ 363,402	$ 76,073

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

Reference 1: 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13476-108611

Name:	us-gaap_DebtInstrumentFairValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant