The Company and Its Significant Accounting Policies Goodwill and Other Intangible Assets (Details)	12 Months Ended
	Sep. 25, 2011	Sep. 26, 2010
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	11	14
Spectrum Licenses [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	5	5
Marketing-related [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	9	18
Technology-based [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	11	14
Customer-related [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	3	5