Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Dec. 29, 2013	Sep. 29, 2013
Assets:
Cash and cash equivalents	$ 1,545.8	$ 2,575.7
Short-term investments: Available-for-sale securities	85.6	591.5
Short-term investments: Trading securities	71.4	66.6
Total short-term investments	157.0	658.1
Short term derivatives	24.6	12.5
Long-term investments: Available-for-sale securities	480.0	58.3
Long-term derivatives	22.3	11.4
Total	2,229.7	3,316.0
Liabilities:
Short-term derivatives	0.3	3.5
Long-term derivatives		0.5
Total derivatives		4.0
Fair Value, Inputs, Level 1 [Member]
Assets:
Cash and cash equivalents	1,545.8	2,575.7
Short-term investments: Available-for-sale securities	11.1	352.9
Short-term investments: Trading securities	71.4	66.6
Total short-term investments	82.5	419.5
Short term derivatives	0	0
Long-term investments: Available-for-sale securities	179.1	0
Long-term derivatives	0	0
Total	1,807.4	2,995.2
Liabilities:
Short-term derivatives	0	0
Long-term derivatives		0
Total derivatives		0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments: Available-for-sale securities	74.5	238.6
Short-term investments: Trading securities	0	0
Total short-term investments	74.5	238.6
Short term derivatives	24.6	12.5
Long-term investments: Available-for-sale securities	287.5	44.9
Long-term derivatives	22.3	11.4
Total	408.9	307.4
Liabilities:
Short-term derivatives	0.3	3.5
Long-term derivatives		0.5
Total derivatives		4.0
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Cash and cash equivalents	0	0
Short-term investments: Available-for-sale securities	0	0
Short-term investments: Trading securities	0	0
Total short-term investments	0	0
Short term derivatives	0	0
Long-term investments: Available-for-sale securities	13.4	13.4
Long-term derivatives	0	0
Total	13.4	13.4
Liabilities:
Short-term derivatives	0	0
Long-term derivatives		0
Total derivatives		0
Agency Obligations [Member]
Assets:
Short-term investments: Available-for-sale securities		20.0
Long-term investments: Available-for-sale securities	20.3	8.1
Agency Obligations [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Short-term investments: Available-for-sale securities		0
Long-term investments: Available-for-sale securities	0	0
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Short-term investments: Available-for-sale securities		20.0
Long-term investments: Available-for-sale securities	20.3	8.1
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments: Available-for-sale securities		0
Long-term investments: Available-for-sale securities	0	0
Commercial Paper [Member]
Assets:
Short-term investments: Available-for-sale securities	35.8	127.0
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Short-term investments: Available-for-sale securities	35.8	127.0
Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Corporate Debt Securities [Member]
Assets:
Short-term investments: Available-for-sale securities	14.2	57.5
Long-term investments: Available-for-sale securities	199.6	36.8
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Long-term investments: Available-for-sale securities	0	0
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Short-term investments: Available-for-sale securities	14.2	57.5
Long-term investments: Available-for-sale securities	199.6	36.8
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Long-term investments: Available-for-sale securities	0	0
Auction Rate Securities [Member]
Assets:
Long-term investments: Available-for-sale securities	13.4	13.4
Auction Rate Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Long-term investments: Available-for-sale securities	0	0
Auction Rate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Long-term investments: Available-for-sale securities	0	0
Auction Rate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Long-term investments: Available-for-sale securities	13.4	13.4
Government Treasury Securities [Member]
Assets:
Short-term investments: Available-for-sale securities	11.1	352.9
Long-term investments: Available-for-sale securities	179.1
Government Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Short-term investments: Available-for-sale securities	11.1	352.9
Long-term investments: Available-for-sale securities	179.1
Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Long-term investments: Available-for-sale securities	0
Government Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Long-term investments: Available-for-sale securities	0
Certificates Of Deposit [Member]
Assets:
Short-term investments: Available-for-sale securities	24.5	34.1
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Certificates Of Deposit [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Short-term investments: Available-for-sale securities	24.5	34.1
Certificates Of Deposit [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Short-term investments: Available-for-sale securities	0	0
Mortgage and Asset-backed Securities [Member]
Assets:
Long-term investments: Available-for-sale securities	67.6
Mortgage and Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Long-term investments: Available-for-sale securities	0
Mortgage and Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Long-term investments: Available-for-sale securities	67.6
Mortgage and Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets:
Long-term investments: Available-for-sale securities	$ 0