Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2018	Sep. 29, 2017	Sep. 30, 2016
Summary Of Significant Accounting Policies [Line Items]
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount	$ 13,400
Maximum credit exposure (percent)	5.00%
Advertising expense	$ 49,519	$ 47,402	$ 44,221
Transaction and re-measurement gains/losses	$ (823)	(74)	$ (474)
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets with definite lives, useful life, minimum years	3 years
Minimum [Member] | Internal Use Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets with definite lives, useful life, minimum years	3 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets with definite lives, useful life, minimum years	18 years
Corrective royalties, percentage of license revenue (percent)	1.00%
Maximum [Member] | Internal Use Software [Member]
Summary Of Significant Accounting Policies [Line Items]
Intangible assets with definite lives, useful life, minimum years	5 years
Foreign Exchange Forward [Member]
Summary Of Significant Accounting Policies [Line Items]
Notional amount of derivative	$ 25,100	$ 24,500