Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 28, 2015 | Sep. 28, 2014 |
Assets: | | |
Total short-term investments | $ 94.7 | $ 135.4 |
Available-for-sale securities | 390.1 | 318.4 |
Total Assets | 2,716.4 | 2,208.9 |
Liabilities: | | |
Total Liabilities | 23.7 | |
Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 2,080.5 | 1,708.4 |
Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 19.6 | 63.2 |
Trading securities | 75.1 | 72.2 |
Total short-term investments | 94.7 | 135.4 |
Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 46.7 | 28.7 |
Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 390.1 | 318.4 |
Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 104.4 | 18 |
Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 13.2 | 2.4 |
Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 10.5 | |
Fair Value, Inputs, Level 1 [Member] | | |
Assets: | | |
Total Assets | 2,272.8 | 1,887.2 |
Liabilities: | | |
Total Liabilities | 1 | |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 2,080.5 | 1,708.4 |
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 10.9 |
Trading securities | 75.1 | 72.2 |
Total short-term investments | 75.1 | 83.1 |
Fair Value, Inputs, Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 0.2 | 0.9 |
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 116.7 | 94.8 |
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 0.3 | 0 |
Fair Value, Inputs, Level 1 [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 1 | 0.4 |
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 0 | |
Significant Other Observable Inputs (Level 2) [Member] | | |
Assets: | | |
Total Assets | 437.7 | 307.9 |
Liabilities: | | |
Total Liabilities | 22.7 | |
Significant Other Observable Inputs (Level 2) [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 19.6 | 52.3 |
Trading securities | 0 | 0 |
Total short-term investments | 19.6 | 52.3 |
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 46.5 | 27.8 |
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 267.5 | 209.8 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 104.1 | 18 |
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 12.2 | 2 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 10.5 | |
Significant Unobservable Inputs (Level 3) [Member] | | |
Assets: | | |
Total Assets | 5.9 | 13.8 |
Liabilities: | | |
Total Liabilities | 0 | |
Significant Unobservable Inputs (Level 3) [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Trading securities | 0 | 0 |
Total short-term investments | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 5.9 | 13.8 |
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 0 | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 0 | |
Agency Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 16.2 | 8.9 |
Agency Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 16.2 | 8.9 |
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Corporate Debt Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 15 | 4.9 |
Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 161.6 | 130.9 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 15 | 4.9 |
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 161.6 | 130.9 |
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Auction Rate Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 5.9 | 13.8 |
Auction Rate Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Auction Rate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Auction Rate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 5.9 | 13.8 |
Foreign Government Obligations [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 1.2 | 33.7 |
Foreign Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 21.9 | 17.4 |
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Foreign Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 1.2 | 33.7 |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 21.9 | 17.4 |
Foreign Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Foreign Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
US Government Treasury Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 10.9 |
US Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 116.7 | 94.8 |
US Government Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 10.9 |
US Government Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 116.7 | 94.8 |
US Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 0 |
US Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
US Government Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 0 |
US Government Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
State and Local Government Obligations [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 3.4 | 12.7 |
State and Local Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 16.4 | 6.7 |
State and Local Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
State and Local Government Obligations [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
State and Local Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 3.4 | 12.7 |
State and Local Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 16.4 | 6.7 |
State and Local Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
State and Local Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Certificates Of Deposit [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 1 |
Certificates Of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 0 |
Certificates Of Deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 1 |
Certificates Of Deposit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 0 |
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 51.4 | 45.9 |
Mortgage and Other Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Mortgage and Other Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 51.4 | 45.9 |
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | $ 0 | $ 0 |