Fair Value Measurements (Fair Value Measured On A Recurring Basis) (Details) (USD $)	Nov. 24, 2012		Aug. 25, 2012
Restricted Cash and Cash Equivalents	$ 55,200,000		$ 55,300,000
Mutual funds	18,428,000	[1]	17,903,000	[1]
Restricted Cash and Cash Equivalents, Current	46,700,000		45,900,000
Restricted Cash and Cash Equivalents, Noncurrent	8,500,000		9,400,000
Money Market Funds [Member]
Cash and Cash Equivalents, Fair Value Disclosure	5,366,000		18,902,000
Restricted Cash and Cash Equivalents	186,000	[2]
Auction Rate Securities [Member]
Investment securities	23,489,000		23,720,000
Short Term Bond Mutual Fund [Member]
Investment securities	8,017,000		5,000,000
Equity Securities [Member]
Investment securities	1,542,000		1,271,000
Municipal Debt Securities [Member]
Restricted Cash and Investments	55,032,000	[2]	55,303,000	[2]
Level 1 [Member]
Mutual funds	18,428,000	[1]	17,903,000	[1]
Level 1 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents, Fair Value Disclosure	5,366,000		18,902,000
Restricted Cash and Cash Equivalents	186,000	[2]
Level 1 [Member] | Auction Rate Securities [Member]
Investment securities	0		0
Level 1 [Member] | Short Term Bond Mutual Fund [Member]
Investment securities	8,017,000		5,000,000
Level 1 [Member] | Equity Securities [Member]
Investment securities	1,542,000		1,271,000
Level 1 [Member] | Municipal Debt Securities [Member]
Restricted Cash and Investments	0	[2]	0	[2]
Level 2 [Member]
Mutual funds	0	[1]	0	[1]
Level 2 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Restricted Cash and Cash Equivalents	0	[2]
Level 2 [Member] | Auction Rate Securities [Member]
Investment securities	100,000		0
Level 2 [Member] | Short Term Bond Mutual Fund [Member]
Investment securities	0		0
Level 2 [Member] | Equity Securities [Member]
Investment securities	0		0
Level 2 [Member] | Municipal Debt Securities [Member]
Restricted Cash and Investments	55,032,000	[2]	55,303,000	[2]
Level 3 [Member]
Mutual funds	0	[1]	0	[1]
Level 3 [Member] | Money Market Funds [Member]
Cash and Cash Equivalents, Fair Value Disclosure	0		0
Restricted Cash and Cash Equivalents	0	[2]
Level 3 [Member] | Auction Rate Securities [Member]
Investment securities	23,389,000		23,720,000
Level 3 [Member] | Short Term Bond Mutual Fund [Member]
Investment securities	0		0
Level 3 [Member] | Equity Securities [Member]
Investment securities	0		0
Level 3 [Member] | Municipal Debt Securities [Member]
Restricted Cash and Investments	$ 0	[2]	$ 0	[2]

[1] Represents assets held pursuant to a deferred compensation plan for certain key management employees.

[2] As of November 24, 2012, restricted cash and investments of $46.7 million and $8.5 million were included in Restricted Cash and Investments and Other Assets, respectively, in the Consolidated Condensed Balance Sheets. As of August 25, 2012, restricted cash and investments of $45.9 million and $9.4 million were included in Restricted Cash and Investments and Other Assets, respectively, in the Consolidated Condensed Balance Sheets