Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 27, 2013	Sep. 27, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 76,850	$ 97,974
Less: allowance for doubtful accounts	901	514
Accounts receivable, net	75,949	97,460
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	72,660	86,823
Patent Administration Program [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable related to patent administration program	$ 4,190	$ 11,151