Summary Of Significant Accounting Policies (Recent Accounting Pronouncements) (Details) $ in Thousands	12 Months Ended
	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Oct. 01, 2016 USD ($)
New Accounting Pronouncements or Change in Accounting Principle
Tax Cuts and Jobs Act, reclassification from AOCIL to retained earnings	$ 47,077	$ 0	$ 0
Number of revenue streams	4
Accounting Standards Update 2014-09 | Pro Forma | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle
Anticipated impact of adoption	$ 16,000
Operating Expense | Accounting Standards Update 2017-07 | Pro Forma
New Accounting Pronouncements or Change in Accounting Principle
Anticipated impact of adoption	(6,778)	(12,595)
Other Nonoperating Income (Expense) | Accounting Standards Update 2017-07 | Pro Forma
New Accounting Pronouncements or Change in Accounting Principle
Anticipated impact of adoption	$ 6,778	$ 12,595