Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 30, 2018 | Sep. 30, 2018 |
Assets: | | |
Total short-term investments | $ 230.2 | $ 181.5 |
Available-for-sale securities | 265 | 267.7 |
Total Assets | 5,291.4 | 9,240.4 |
Liabilities: | | |
Total Liabilities | 71.2 | 50 |
Goodwill | 3,560.3 | 3,541.6 |
Intangible Assets, Net (Excluding Goodwill) | 981.6 | 1,042.2 |
Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 4,761.6 | 8,756.3 |
Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 173.7 | 106.2 |
Trading securities | 56.5 | 75.3 |
Total short-term investments | 230.2 | 181.5 |
Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 25.1 | 24.5 |
Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 265 | 267.7 |
Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 9.5 | 10.4 |
Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 19.4 | 6.5 |
Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 51.8 | 43.5 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | | |
Assets: | | |
Total Assets | 4,957.7 | 8,940.9 |
Liabilities: | | |
Total Liabilities | 2.1 | 0.4 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 4,761.6 | 8,756.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 25 | 0 |
Trading securities | 56.5 | 75.3 |
Total short-term investments | 81.5 | 75.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 0 | 1.2 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 114.6 | 108.1 |
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 | 2.1 | 0.4 |
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 | 328 | 293.6 |
Liabilities: | | |
Total Liabilities | 69.1 | 49.6 |
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 | 148.7 | 106.2 |
Trading securities | 0 | 0 |
Total short-term investments | 148.7 | 106.2 |
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 25.1 | 23.3 |
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 144.7 | 153.7 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 9.5 | 10.4 |
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 17.3 | 6.1 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 51.8 | 43.5 |
Significant Unobservable Inputs (Level 3) [Member] | | |
Assets: | | |
Total Assets | 5.7 | 5.9 |
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 | 5.7 | 5.9 |
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 |
Certificates of Deposit [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 3 | |
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 | |
Certificates of Deposit [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 3 | |
Certificates of Deposit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | |
Agency Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 6 | 5.9 |
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] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 6 | 5.9 |
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 | 10.5 | 8.4 |
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 | 10.5 | 8.4 |
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 | 119 | 91.8 |
Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 121.7 | 114.5 |
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 | 119 | 91.8 |
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 121.7 | 114.5 |
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 | 3.6 | |
Foreign Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 3.6 |
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 | |
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 |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 3.6 | |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 3.6 |
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 |
U.S. Government Treasury Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 25 | |
U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 114.6 | 108.1 |
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 | 25 | |
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 | 114.6 | 108.1 |
U.S. Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 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 | |
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] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 4.8 | 4.8 |
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] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 4.8 | 4.8 |
State and Local Government Obligations [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 | 5.7 | 5.9 |
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 | 5.7 | 5.9 |
Mortgage and Other Asset-backed Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 12.6 | 6 |
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 12.2 | 24.9 |
Mortgage and Other Asset-backed Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
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] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 12.6 | 6 |
Mortgage and Other Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 12.2 | 24.9 |
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | $ 0 | $ 0 |