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Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Apr. 01, 2018	Jul. 02, 2017	Jul. 01, 2018	Jul. 02, 2017	Oct. 01, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment			$ 28.5	$ 87.2
Assets:
Total short-term investments			84.5		$ 228.6
Available-for-sale securities			261.4		542.3
Total Assets			2,270.0		3,271.0
Liabilities:
Total Liabilities			60.6		38.5
Goodwill			3,647.6		1,539.2
Intangible Assets, Net (Excluding Goodwill)			1,122.9		441.4
Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents			1,892.1		2,462.3
Short-term Investments [Member]
Assets:
Available-for-sale securities			13.2		151.7
Trading securities			71.3		76.9
Total short-term investments			84.5		228.6
Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets			25.1		13.4
Long-term Investments [Member]
Assets:
Available-for-sale securities			261.4		542.3
Other Long-Term Assets [Member]
Assets:
Derivative assets			6.9		24.4
Accrued Liabilities [Member]
Liabilities:
Derivative liabilities			7.0		16.4
Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities			53.6		22.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Total Assets			2,067.8		2,748.1
Liabilities:
Total Liabilities			1.2		2.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents			1,892.1		2,462.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities			0.0		81.4
Trading securities			71.3		76.9
Total short-term investments			71.3		158.3
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets			0.8		0.1
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			103.6		127.4
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Other Long-Term Assets [Member]
Assets:
Derivative assets			0.0		0.0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities			1.2		2.5
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities			0.0		0.0
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Total Assets			196.3		517.0
Liabilities:
Total Liabilities			59.4		36.0
Significant Other Observable Inputs (Level 2) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents			0.0		0.0
Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities			13.2		70.3
Trading securities			0.0		0.0
Total short-term investments			13.2		70.3
Significant Other Observable Inputs (Level 2) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets			24.3		13.3
Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			151.9		409.0
Significant Other Observable Inputs (Level 2) [Member] \| Other Long-Term Assets [Member]
Assets:
Derivative assets			6.9		24.4
Significant Other Observable Inputs (Level 2) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities			5.8		13.9
Significant Other Observable Inputs (Level 2) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities			53.6		22.1
Significant Unobservable Inputs (Level 3) [Member]
Assets:
Total Assets			5.9		5.9
Liabilities:
Total Liabilities			0.0		0.0
Significant Unobservable Inputs (Level 3) [Member] \| Cash and Cash Equivalents [Member]
Assets:
Cash and cash equivalents			0.0		0.0
Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities			0.0		0.0
Trading securities			0.0		0.0
Total short-term investments			0.0		0.0
Significant Unobservable Inputs (Level 3) [Member] \| Prepaid Expenses and Other Current Assets [Member]
Assets:
Derivative assets			0.0		0.0
Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			5.9		5.9
Significant Unobservable Inputs (Level 3) [Member] \| Other Long-Term Assets [Member]
Assets:
Derivative assets			0.0		0.0
Significant Unobservable Inputs (Level 3) [Member] \| Accrued Liabilities [Member]
Liabilities:
Derivative liabilities			0.0		0.0
Significant Unobservable Inputs (Level 3) [Member] \| Other Long-Term Liabilities [Member]
Liabilities:
Derivative liabilities			0.0		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			5.9		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					0.0
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		0.0
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			5.9		21.8
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		0.0
Commercial Paper [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities					2.0
Commercial Paper [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] \| Short-term Investments [Member]
Assets:
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Commercial Paper [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities					2.0
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			11.8		49.4
Corporate Debt Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			108.9		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		0.0
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		0.0
Corporate Debt Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities			11.8		49.4
Corporate Debt Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			108.9		207.4
Corporate Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities			0.0		0.0
Corporate Debt Securities [Member] \| Significant Unobservable Inputs (Level 3) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			0.0		0.0
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			3.6		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					0.0
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		0.0
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			3.6		17.1
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		0.0
U.S. Government Treasury Securities [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities					81.4
U.S. Government Treasury Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			103.6		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					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			103.6		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
U.S. Government Treasury Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			0.0		0.0
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		0.0
State and Local Government Obligations [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities					2.0
State and Local Government Obligations [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			4.8		7.0
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		0.0
State and Local Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities					2.0
State and Local Government Obligations [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			4.8		7.0
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		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					0.0
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					0.0
Auction Rate Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			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		0.0
Auction Rate Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			0.0		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
Mortgage and Other Asset-backed Securities [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities			1.4
Mortgage and Other Asset-backed Securities [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			28.7		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		0.0
Mortgage and Other Asset-backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Short-term Investments [Member]
Assets:
Available-for-sale securities			1.4
Mortgage and Other Asset-backed Securities [Member] \| Significant Other Observable Inputs (Level 2) [Member] \| Long-term Investments [Member]
Assets:
Available-for-sale securities			28.7		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		$ 0.0
Starbucks Coffee Switzerland [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment	$ 28.5	$ 17.9
Liabilities:
Goodwill			$ 8.9
Teavana [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment		69.3
Liabilities:
Goodwill		398.3		398.3
Intangible Assets, Net (Excluding Goodwill)		117.2		$ 117.2
Asset Impairment Charges		$ 33.0