Composition Of Certain Financial Statement Captions Composition Of Certain Financial Statement Captions (Schedule Of Accounts Receivable) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2012	Sep. 28, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable, gross	$ 52,496	$ 44,451
Allowance for Doubtful Accounts Receivable	(699)	(956)
Accounts receivable, net	51,797	43,495
Trade Accounts Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade Accounts Receivable	50,172	43,565
Patent Administration Program [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Related To Patent Administration Program	$ 2,324	$ 886