Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014
Summary Of Significant Accounting Policies [Line Items]
Maximum credit exposure (percent)	5.00%
Goodwill	$ 309,616	$ 307,708	$ 277,574
Advertising expense	44,221	46,202	37,895
Transaction and re-measurement gains/losses	$ (474)	(142)	$ 498
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	$ 18,300	$ 22,300
Customer Concentration Risk [Member] | Sales Revenue, Goods, Net [Member]
Summary Of Significant Accounting Policies [Line Items]
Percent of revenue from significant customer (percent)		12.00%	11.00%