The Company and Its Significant Accounting Policies Goodwill and Other Intangible Assets (Details)	12 Months Ended
	Sep. 28, 2014	Sep. 29, 2013
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	11 years 0 months 0 days	11 years 0 months 0 days
Wireless spectrum [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	14 years 0 months 0 days	14 years 0 months 0 days
Marketing-related [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	9 years 0 months 0 days	9 years 0 months 0 days
Technology-based [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	11 years 0 months 0 days	11 years 0 months 0 days
Customer-related [Member]
Weighted-Average Amortization Periods for Finite-Lived Intangible Assets, by Class [Line Items]
Weighted-average amortization period (in years)	6 years 0 months 0 days	2 years 0 months 0 days