Valuation And Qualifying Accounts (Schedule Of Valuation And Qualifying Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 29, 2012
Allowance For Losses On Accounts Receivable [Member]
Balance at beginning of period	$ 1,008	$ 1,011	$ 3,256
Additions charged to costs and expenses	513	1,036	259
Deductions	333	1,039	2,504
Balance at end of period	1,188	1,008	1,011
Valuation Allowance On Deferred Income Tax Assets [Member]
Balance at beginning of period	34,075	27,087	5,116
Additions charged to costs and expenses	7,860	6,988	21,971
Balance at end of period	$ 41,935	$ 34,075	$ 27,087