Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 25, 2015	Sep. 26, 2014	Sep. 27, 2013
Tax Credit Carryforward [Line Items]
Deferred income tax withholding tax foreign earnings	$ 678,100
U.S. income taxes, adjusted for any foreign tax credits, and withholding taxes	173,000
Net operating loss carryovers for Federal tax purposes	3,000
Net operating loss carryovers for California tax purposes	$ 9,700
Effective tax rate	21.00%	25.40%	24.40%
Unrecognized tax benefits, gross	$ 75,168	$ 65,161	$ 31,351	$ 32,468
Unrecognized tax benefits if recognized, would affect our effective tax rate	62,100
Estimated decrease in unrecognized tax benefits due to lapse in statute of limitations	2,700
Unrecognized tax benefits, expected reduction as a result of settlement	1,100
Increase in interest expense for current tax provision	400	600
Reduction in penalties for current tax provision	(500)	$ (400)
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration	6,800
Deferred Tax Assets, Tax Credit Carryforwards, Research	4,900
Foreign Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	7,000
California Research Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	16,500
Research Tax Credit Carryforward [Member]
Tax Credit Carryforward [Line Items]
Tax credit carryforward	$ 1,000