Summary Of Significant Accounting Policies (Schedule Of Accounts Receivable Reserve Activity) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 24, 2011	Sep. 25, 2010	Sep. 26, 2009
Summary Of Significant Accounting Policies [Abstract]
Balance at Beginning of Period	$ 7,769	$ 7,279	$ 6,326
Charged to Costs and Expenses	1,614	1,895	2,334
Write-offs and Payments	(2,867)	(1,405)	(1,381)
Balance at End of Period	$ 6,516	$ 7,769	$ 7,279