Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | Jun. 28, 2020 | Sep. 29, 2019 |
Assets: | | |
Total short-term investments | $ 229.9 | $ 70.5 |
Total Assets | 4,537.8 | 3,016 |
Liabilities: | | |
Financial Liabilities Fair Value Disclosure | 101.3 | 18.2 |
Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 3,965.9 | 2,686.6 |
Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 170.1 | 4 |
Equity Securities, FV-NI | 59.8 | 66.5 |
Total short-term investments | 229.9 | 70.5 |
Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets, current | 20.7 | 12.6 |
Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 223.4 | 220 |
Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets, Noncurrent | 97.9 | 26.3 |
Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Current | 21.3 | 5.7 |
Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Noncurrent | 80 | 12.5 |
Commercial Paper [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 37.6 | 0.5 |
Corporate Debt Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 106 | 3.5 |
Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 90.6 | 101.2 |
U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 98.9 | 106.5 |
State and Local Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 3.6 | 4.9 |
Auction Rate Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 5.7 | 5.8 |
Mortgage and Other Asset-backed Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 11.8 | |
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 24.6 | 1.6 |
Foreign Government Short-term Debt Securities | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 8.5 | |
Certificates of Deposit | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 6.2 | |
Fair Value, Inputs, Level 1 [Member] | | |
Assets: | | |
Total Assets | 4,124.9 | 2,859.6 |
Liabilities: | | |
Financial Liabilities Fair Value Disclosure | 14.2 | 1.1 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 3,965.9 | 2,686.6 |
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Equity Securities, FV-NI | 59.8 | 66.5 |
Total short-term investments | 59.8 | 66.5 |
Fair Value, Inputs, Level 1 [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets, current | 0.3 | 0 |
Fair Value, Inputs, Level 1 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 98.9 | 106.5 |
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets, Noncurrent | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Current | 14.1 | 1.1 |
Fair Value, Inputs, Level 1 [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Noncurrent | 0.1 | 0 |
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 98.9 | 106.5 |
Fair Value, Inputs, Level 1 [Member] | State and Local Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Mortgage and Other Asset-backed Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | |
Fair Value, Inputs, Level 1 [Member] | Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 1 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | |
Fair Value, Inputs, Level 1 [Member] | Certificates of Deposit | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | |
Fair Value, Inputs, Level 2 [Member] | | |
Assets: | | |
Total Assets | 407.2 | 150.6 |
Liabilities: | | |
Financial Liabilities Fair Value Disclosure | 87.1 | 17.1 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 170.1 | 4 |
Equity Securities, FV-NI | 0 | 0 |
Total short-term investments | 170.1 | 4 |
Fair Value, Inputs, Level 2 [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets, current | 20.4 | 12.6 |
Fair Value, Inputs, Level 2 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 118.8 | 107.7 |
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets, Noncurrent | 97.9 | 26.3 |
Fair Value, Inputs, Level 2 [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Current | 7.2 | 4.6 |
Fair Value, Inputs, Level 2 [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Noncurrent | 79.9 | 12.5 |
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 37.6 | 0.5 |
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 106 | 3.5 |
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 90.6 | 101.2 |
Fair Value, Inputs, Level 2 [Member] | U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | State and Local Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 3.6 | 4.9 |
Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 2 [Member] | Mortgage and Other Asset-backed Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 11.8 | |
Fair Value, Inputs, Level 2 [Member] | Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 24.6 | 1.6 |
Fair Value, Inputs, Level 2 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 8.5 | |
Fair Value, Inputs, Level 2 [Member] | Certificates of Deposit | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 6.2 | |
Fair Value, Inputs, Level 3 [Member] | | |
Assets: | | |
Total Assets | 5.7 | 5.8 |
Liabilities: | | |
Financial Liabilities Fair Value Disclosure | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member] | | |
Assets: | | |
Cash and cash equivalents | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Equity Securities, FV-NI | 0 | 0 |
Total short-term investments | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Prepaid Expenses and Other Current Assets [Member] | | |
Assets: | | |
Derivative assets, current | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 5.7 | 5.8 |
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Assets [Member] | | |
Assets: | | |
Derivative assets, Noncurrent | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Accrued Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Current | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Other Long-Term Liabilities [Member] | | |
Liabilities: | | |
Derivative liabilities, Noncurrent | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | State and Local Government Obligations [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 5.7 | 5.8 |
Fair Value, Inputs, Level 3 [Member] | Mortgage and Other Asset-backed Securities [Member] | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | |
Fair Value, Inputs, Level 3 [Member] | Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | $ 0 |
Fair Value, Inputs, Level 3 [Member] | Foreign Government Short-term Debt Securities | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | 0 | |
Fair Value, Inputs, Level 3 [Member] | Certificates of Deposit | Short-term Investments [Member] | | |
Assets: | | |
Debt Securities, Available-for-sale | $ 0 | |