Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Apr. 02, 2017 | Oct. 02, 2016 |
Assets: | | |
Total short-term investments | $ 231 | $ 134.4 |
Available-for-sale securities | 1,070.1 | 1,141.7 |
Total Assets | 3,509.2 | 3,439 |
Liabilities: | | |
Total Liabilities | 28.5 | 89.6 |
Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 2,163.9 | 2,128.8 |
Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 160.2 | 65.7 |
Trading securities | 70.8 | 68.7 |
Total short-term investments | 231 | 134.4 |
Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 21.7 | 27.7 |
Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 1,070.1 | 1,141.7 |
Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 22.5 | 6.4 |
Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 13.6 | 18 |
Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 14.9 | 71.6 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | | |
Assets: | | |
Total Assets | 2,580.8 | 2,574.6 |
Liabilities: | | |
Total Liabilities | 1.4 | 1.7 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 2,163.9 | 2,128.8 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 63.7 | 15.8 |
Trading securities | 70.8 | 68.7 |
Total short-term investments | 134.5 | 84.5 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 0.6 | 3.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 281.8 | 358.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 1.4 | 1.7 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 0 | 0 |
Significant Other Observable Inputs (Level 2) [Member] | | |
Assets: | | |
Total Assets | 922.5 | 858.7 |
Liabilities: | | |
Total Liabilities | 27.1 | 87.9 |
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 | 96.5 | 49.9 |
Trading securities | 0 | 0 |
Total short-term investments | 96.5 | 49.9 |
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 21.1 | 24.6 |
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 782.4 | 777.8 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 22.5 | 6.4 |
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 12.2 | 16.3 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 14.9 | 71.6 |
Significant Unobservable Inputs (Level 3) [Member] | | |
Assets: | | |
Total Assets | 5.9 | 5.7 |
Liabilities: | | |
Total Liabilities | 0 | 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 | 5.7 |
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 | 0 |
Agency Obligations [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 3.3 | 1.3 |
Agency Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 35.5 | 44.4 |
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 3.3 | 1.3 |
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 35.5 | 44.4 |
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Commercial Paper [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 19.4 | 2.6 |
Commercial Paper [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 19.4 | 2.6 |
Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Corporate Debt Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 52.7 | 34.2 |
Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 419.6 | 459.3 |
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Corporate Debt Securities [Member] | Quoted Prices in Active Markets for Identical Assets (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 | 52.7 | 34.2 |
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 419.6 | 459.3 |
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 |
Foreign Government Obligations [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 5.8 | 5.5 |
Foreign Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 62.4 | 46.7 |
Foreign Government Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Foreign Government Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (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 | 5.8 | 5.5 |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 62.4 | 46.7 |
Foreign Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 0 |
Foreign Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
U.S. Government Treasury Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 63.7 | 15.8 |
U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 281.8 | 358.2 |
U.S. Government Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 63.7 | 15.8 |
U.S. Government Treasury Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 281.8 | 358.2 |
U.S. Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
U.S. Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
U.S. Government Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
U.S. 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 | 0.5 |
State and Local Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 10.2 | 57.5 |
State and Local Government Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
State and Local Government Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (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 | 0.5 |
State and Local Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 10.2 | 57.5 |
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 | 12.3 | 5.8 |
Certificates of Deposit [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Certificates of Deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 12.3 | 5.8 |
Certificates of Deposit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-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 | 5.7 |
Auction Rate Securities [Member] | Quoted Prices in Active Markets for Identical Assets (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 | 5.7 |
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 254.7 | 169.9 |
Mortgage and Other Asset-backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (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 | 254.7 | 169.9 |
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | $ 0 | $ 0 |