Goodwill And Intangible Assets (Schedule Of Changes In Gross Carrying Amount Of Goodwill And Intangible Assets) (Details) (USD $) In Thousands	12 Months Ended
	Sep. 30, 2011	Oct. 01, 2010
Goodwill and Intangible Assets Gross Total, Beginning Balance	$ 530,482	$ 527,388
Goodwill and Intangible Assets Acquired During Period	268,569	3,131
Goodwill and Intangible Assets Deductions During The Period	(75)	(37)
Goodwill and Intangible Assets Gross Total, Ending Balance	798,976	530,482
Developed Technology [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	14,150	13,750
Goodwill and Intangible Assets Acquired During Period	6,510	400
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	20,660	14,150
Customer Relationships [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	21,510	21,510
Goodwill and Intangible Assets Acquired During Period	36,000	0
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	57,510	21,510
Patents and Other [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	5,966	5,966
Goodwill and Intangible Assets Acquired During Period	47,930	0
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	53,896	5,966
Trademarks [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	3,269	3,269
Goodwill and Intangible Assets Acquired During Period	600	0
Goodwill and Intangible Assets Deductions During The Period	0	0
Goodwill and Intangible Assets Gross Total, Ending Balance	3,869	3,269
Goodwill [Member]
Goodwill and Intangible Assets Gross Total, Beginning Balance	485,587	482,893
Goodwill and Intangible Assets Acquired During Period	177,529	2,731
Goodwill and Intangible Assets Deductions During The Period	(75)	(37)
Goodwill and Intangible Assets Gross Total, Ending Balance	$ 663,041	$ 485,587