Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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Debt And Money Market Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended			9 Months Ended		9 Months Ended
	Jan. 27, 2012	Jul. 27, 2012	Jul. 29, 2011	Oct. 28, 2011	Jul. 27, 2012 Senior Notes Due 2022 At 4.20% [Member]	Jan. 27, 2012 Senior Notes Due 2022 At 4.20% [Member]	Jul. 27, 2012 Senior Notes Due 2012 At 5.625% [Member]	May 01, 2012 Senior Notes Due 2012 At 5.625% [Member]
Debt Instrument [Line Items]
Unsecured senior notes					$ 400,000	$ 400,000		$ 200,000
Interest rate of debt instrument						4.20%		5.625%
Proceeds from issuance of debt	396,816	396,816	0
Debt instrument, maturity date					Jan. 15, 2022		May 01, 2012
Fair values of short-term securities		73,743	18,042	34,114
Restricted cash		$ 19,828	$ 21,062	$ 20,378