Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | |
Apr. 01, 2018 | Apr. 01, 2018 | Apr. 02, 2017 | Oct. 01, 2017 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Impairment | | $ 28.5 | $ 0 | |
Assets: | | | | |
Total short-term investments | $ 100.5 | 100.5 | | $ 228.6 |
Available-for-sale securities | 293.1 | 293.1 | | 542.3 |
Total Assets | 2,560.6 | 2,560.6 | | 3,271 |
Liabilities: | | | | |
Total Liabilities | 82.8 | 82.8 | | 38.5 |
Goodwill | 3,793.5 | 3,793.5 | | 1,539.2 |
Intangible Assets, Net (Excluding Goodwill) | 1,228.4 | 1,228.4 | | 441.4 |
Cash and Cash Equivalents [Member] | | | | |
Assets: | | | | |
Cash and cash equivalents | 2,142 | 2,142 | | 2,462.3 |
Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 31.3 | 31.3 | | 151.7 |
Trading securities | 69.2 | 69.2 | | 76.9 |
Total short-term investments | 100.5 | 100.5 | | 228.6 |
Prepaid Expenses and Other Current Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 23.4 | 23.4 | | 13.4 |
Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 293.1 | 293.1 | | 542.3 |
Other Long-Term Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 1.6 | 1.6 | | 24.4 |
Accrued Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 18.7 | 18.7 | | 16.4 |
Other Long-Term Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 64.1 | 64.1 | | 22.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | | | | |
Assets: | | | | |
Total Assets | 2,324.8 | 2,324.8 | | 2,748.1 |
Liabilities: | | | | |
Total Liabilities | 2.5 | 2.5 | | 2.5 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Cash and Cash Equivalents [Member] | | | | |
Assets: | | | | |
Cash and cash equivalents | 2,142 | 2,142 | | 2,462.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 10.5 | 10.5 | | 81.4 |
Trading securities | 69.2 | 69.2 | | 76.9 |
Total short-term investments | 79.7 | 79.7 | | 158.3 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Prepaid Expenses and Other Current Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 0.3 | 0.3 | | 0.1 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 102.8 | 102.8 | | 127.4 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 0 | 0 | | 0 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Accrued Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 2.5 | 2.5 | | 2.5 |
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other Long-Term Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 0 | 0 | | 0 |
Significant Other Observable Inputs (Level 2) [Member] | | | | |
Assets: | | | | |
Total Assets | 229.9 | 229.9 | | 517 |
Liabilities: | | | | |
Total Liabilities | 80.3 | 80.3 | | 36 |
Significant Other Observable Inputs (Level 2) [Member] | Cash and Cash Equivalents [Member] | | | | |
Assets: | | | | |
Cash and cash equivalents | 0 | 0 | | 0 |
Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 20.8 | 20.8 | | 70.3 |
Trading securities | 0 | 0 | | 0 |
Total short-term investments | 20.8 | 20.8 | | 70.3 |
Significant Other Observable Inputs (Level 2) [Member] | Prepaid Expenses and Other Current Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 23.1 | 23.1 | | 13.3 |
Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 184.4 | 184.4 | | 409 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 1.6 | 1.6 | | 24.4 |
Significant Other Observable Inputs (Level 2) [Member] | Accrued Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 16.2 | 16.2 | | 13.9 |
Significant Other Observable Inputs (Level 2) [Member] | Other Long-Term Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 64.1 | 64.1 | | 22.1 |
Significant Unobservable Inputs (Level 3) [Member] | | | | |
Assets: | | | | |
Total Assets | 5.9 | 5.9 | | 5.9 |
Liabilities: | | | | |
Total Liabilities | 0 | 0 | | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Cash and Cash Equivalents [Member] | | | | |
Assets: | | | | |
Cash and cash equivalents | 0 | 0 | | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 0 | 0 | | 0 |
Trading securities | 0 | 0 | | 0 |
Total short-term investments | 0 | 0 | | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Prepaid Expenses and Other Current Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 0 | 0 | | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 5.9 | 5.9 | | 5.9 |
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Assets [Member] | | | | |
Assets: | | | | |
Derivative assets | 0 | 0 | | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Accrued Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 0 | 0 | | 0 |
Significant Unobservable Inputs (Level 3) [Member] | Other Long-Term Liabilities [Member] | | | | |
Liabilities: | | | | |
Derivative liabilities | 0 | 0 | | 0 |
Agency Obligations [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 7.5 |
Agency Obligations [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 8.4 | 8.4 | | 21.8 |
Agency Obligations [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 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 | | 0 |
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 7.5 |
Agency Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 8.4 | 8.4 | | 21.8 |
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 0 |
Agency Obligations [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 0 | 0 | | 0 |
Commercial Paper [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 2 |
Commercial Paper [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 0 |
Commercial Paper [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 2 |
Commercial Paper [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 0 |
Corporate Debt Securities [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 19 | 19 | | 49.4 |
Corporate Debt Securities [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 126.8 | 126.8 | | 207.4 |
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 | | 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 | | 0 |
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 19 | 19 | | 49.4 |
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 126.8 | 126.8 | | 207.4 |
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 0 | 0 | | 0 |
Corporate Debt Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 0 | 0 | | 0 |
Foreign Government Obligations [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 7.1 |
Foreign Government Obligations [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 12.1 | 12.1 | | 17.1 |
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 | 0 | | 0 |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 7.1 |
Foreign Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 12.1 | 12.1 | | 17.1 |
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 | | 0 |
U.S. Government Treasury Securities [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 10.5 | 10.5 | | 81.4 |
U.S. Government Treasury Securities [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 102.8 | 102.8 | | 127.4 |
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 | 10.5 | 10.5 | | 81.4 |
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 | 102.8 | 102.8 | | 127.4 |
U.S. Government Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 0 | 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 | | 0 |
U.S. Government Treasury Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 0 | 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 | | 0 |
State and Local Government Obligations [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 2 |
State and Local Government Obligations [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 4.8 | 4.8 | | 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 | | 0 |
State and Local Government Obligations [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 2 |
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 | | 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 | | 0 |
Certificates of Deposit [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 2.3 |
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 | | | | 2.3 |
Certificates of Deposit [Member] | Significant Unobservable Inputs (Level 3) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | | | | 0 |
Auction Rate Securities [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 5.9 | 5.9 | | 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 | | 0 |
Auction Rate Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 0 | 0 | | 0 |
Auction Rate Securities [Member] | Significant Unobservable Inputs (Level 3) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 5.9 | 5.9 | | 5.9 |
Mortgage and Other Asset-backed Securities [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 1.8 | 1.8 | | |
Mortgage and Other Asset-backed Securities [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 32.3 | 32.3 | | 155.7 |
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 | | 0 |
Mortgage and Other Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Short-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 1.8 | 1.8 | | |
Mortgage and Other Asset-backed Securities [Member] | Significant Other Observable Inputs (Level 2) [Member] | Long-term Investments [Member] | | | | |
Assets: | | | | |
Available-for-sale securities | 32.3 | 32.3 | | 155.7 |
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 | | $ 0 |
Starbucks Coffee Switzerland [Member] | | | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | | | |
Impairment | $ 28.5 | | | |