Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Dec. 27, 2015 | Sep. 27, 2015 |
Assets: | | |
Total short-term investments | $ 116.4 | $ 81.3 |
Available-for-sale securities | 366.9 | 312.5 |
Total Assets | 2,851.6 | 2,029.4 |
Liabilities: | | |
Total Liabilities | 41.7 | 33.7 |
Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 2,263.5 | 1,530.1 |
Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 46.8 | 15.5 |
Trading securities | 69.6 | 65.8 |
Total short-term investments | 116.4 | 81.3 |
Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 54.7 | 50.8 |
Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 366.9 | 312.5 |
Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 50.1 | 54.7 |
Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 27.5 | 19.2 |
Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 14.2 | 14.5 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | | |
Assets: | | |
Total Assets | 2,486.3 | 1,700.7 |
Liabilities: | | |
Total Liabilities | 6.5 | 3.6 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 2,263.5 | 1,530.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 6.6 | 0 |
Trading securities | 69.6 | 65.8 |
Total short-term investments | 76.2 | 65.8 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 0 | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 146.6 | 104.8 |
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 | 6.5 | 3.6 |
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 | 359.6 | 322.8 |
Liabilities: | | |
Total Liabilities | 35.2 | 30.1 |
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 | 40.2 | 15.5 |
Trading securities | 0 | 0 |
Total short-term investments | 40.2 | 15.5 |
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets | 54.7 | 50.8 |
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 214.6 | 201.8 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets | 50.1 | 54.7 |
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 21 | 15.6 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities | 14.2 | 14.5 |
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 |
Corporate Debt Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 5.6 | 10.2 |
Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 138.4 | 121.8 |
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 | 5.6 | 10.2 |
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 138.4 | 121.8 |
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 |
Equity Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 28.6 | |
Equity Securities [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | |
Equity Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 28.6 | |
Equity Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | |
Foreign Government Obligations [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 6 | 2 |
Foreign Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 14.5 | 18.5 |
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 | 6 | 2 |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 14.5 | 18.5 |
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 |
U.S. Government Treasury Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 6.6 | |
U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 146.6 | 104.8 |
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 | 6.6 | |
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 | 146.6 | 104.8 |
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 |
Agency Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 4.8 | 8.6 |
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 | 4.8 | 8.6 |
Agency 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 |
State and Local Government Obligations [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 3.3 |
State and Local Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 8.6 | 9.7 |
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 |
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 | | 3.3 |
State and Local Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 8.6 | 9.7 |
State and Local Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | | 0 |
State and Local Government Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 0 | 0 |
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | 48.3 | 43.2 |
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 | 48.3 | 43.2 |
Mortgage and Other Asset-backed Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | |
Assets: | | |
Available-for-sale securities | $ 0 | $ 0 |