Acquisition (Narrative) (Details) $ in Millions, ¥ in Billions								3 Months Ended						8 Months Ended	9 Months Ended
	Jun. 12, 2015 JPY (¥)	Jun. 12, 2015 USD ($)	Mar. 26, 2015	Dec. 29, 2014 JPY (¥)	Dec. 29, 2014 USD ($)	Oct. 31, 2014 JPY (¥)	Oct. 31, 2014 USD ($)	Sep. 27, 2015 JPY (¥)	Sep. 27, 2015 USD ($)	Jun. 28, 2015 JPY (¥)	Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)		Jun. 28, 2015 USD ($)	Jun. 28, 2015 USD ($)	Jun. 29, 2014 USD ($)	Dec. 28, 2014	Oct. 26, 2014	Sep. 28, 2014
Business Acquisition [Line Items]
Gain resulting from acquisition of joint venture											$ 0.0	$ 0.0			$ 390.6	$ 0.0
Starbucks Coffee Japan Ltd Member
Business Acquisition [Line Items]
Preexisting ownership percentage in Starbucks Japan																			39.50%
Remaining Ownership Interest in Equity Method Investee to be Acquired																			60.50%
Reason for acquisition															Acquiring Starbucks Japan further leverages our existing infrastructure to continue disciplined retail store growth and expand our presence into other channels in the Japan market, such as consumer packaged goods ("CPG"), licensing and foodservice
Additional ownership interest in Starbucks Japan acquired				14.70%	14.70%		39.50%
Cash paid to acquire additional ownership interest in Starbucks Japan	¥ 13.5	$ 109.0		¥ 31.0	$ 258.0	¥ 55.0	$ 508.7			¥ 9.6	$ 78.0
Total ownership interest in Starbucks Japan acquired through first tender offer step							79.00%
Remaining interest of minority shareholders' to be acquired			6.30%				21.00%										21.00%
Ownership interest after conclusion of Cash-out procedure			100.00%
Reference conversion rate				120.39	120.39						123.87			123.87	123.87			108.13
Acquisition-related costs incurred											$ 0.0				$ 11.5
Acquisition date						Oct. 31, 2014	Oct. 31, 2014
Acquisition date fair value of goodwill, adjustment											(4.0)
Definite-lived intangible assets, effect of foreign currency translation														$ (41.0)
Definite-lived intangible assets, amortization expense											11.0				30.0
Acquired definite-lived intangible assets, amortization expense, next twelve months											43.0			43.0	43.0
Acquired definite-lived intangible assets, amortization expense, year two											43.0			43.0	43.0
Acquired definite-lived intangible assets, amortization expense, year three											43.0			43.0	43.0
Acquired definite-lived intangible assets, amortization expense, year four											43.0			43.0	43.0
Acquired definite-lived intangible assets, amortization expense, year five											43.0			43.0	43.0
Acquired definite-lived intangible assets, amortization expense, after year five											38.0			$ 38.0	38.0
Goodwill							$ 811.6								708.0
Goodwill description						the intangible assets that do not qualify for separate recognition and primarily includes the acquired current customer base, the acquired workforce including store partners in the region that have strong relationships with these customers, the existing geographic retail and online presence, and the expected geographic presence in new channels	the intangible assets that do not qualify for separate recognition and primarily includes the acquired current customer base, the acquired workforce including store partners in the region that have strong relationships with these customers, the existing geographic retail and online presence, and the expected geographic presence in new channels
Goodwill, effect of foreign currency translation															(103.6)
Favorable lease assets acquired							$ 7.5
Unfavorable lease liabilities assumed							$ 15.5
Favorable lease assets and unfavorable lease liabilities, weighted average remaining term (years)						9 years 5 months	9 years 5 months
Unfavorable/favorable leases, rent expense/(reduction)											(0.2)				(0.6)
Gain resulting from acquisition of joint venture															390.6
Fair value of preexisting equity interest							$ 577.0
Starbucks Japan revenue included in consolidated statements of earnings											332.7				816.8
Starbucks Japan net earnings included in consolidated statements of earnings											42.3				81.1
Pro forma revenue											4,881.2	4,470.8			14,339.7	13,149.6
Pro forma net earnings attributable to Starbucks											626.9	$ 523.1	[1]		1,724.2	$ 1,863.4
Transaction and integration costs											$ 0.5				$ 12.7
Starbucks Coffee Japan Ltd Member | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Cash paid to acquire additional ownership interest in Starbucks Japan								¥ 3.9	$ 31.0
Starbucks Coffee Japan Ltd Member | Reacquired Rights
Business Acquisition [Line Items]
Definite-lived intangible assets acquired							$ 305.0
Definite-lived intangible assets, life (years)						6 years 5 months	6 years 5 months
Starbucks Coffee Japan Ltd Member | Licensing Agreements
Business Acquisition [Line Items]
Definite-lived intangible assets acquired							$ 15.0
Definite-lived intangible assets, life (years)						10 years 11 months	10 years 11 months
Starbucks Coffee Japan Ltd Member | Customer Loyalty Program
Business Acquisition [Line Items]
Definite-lived intangible assets acquired							$ 3.0
Definite-lived intangible assets, life (years)						4 years	4 years

[1] The pro forma net earnings attributable to Starbucks for fiscal 2014 includes the acquisition-related gain of $390.6 million in our first quarter of fiscal 2014, and transaction and integration costs of $0.5 million and $12.7 million for the quarter and three quarters ended June 29, 2014, respectively.