Acquisition (Narrative) (Details) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		0 Months Ended					3 Months Ended			5 Months Ended	6 Months Ended								0 Months Ended			12 Months Ended
	Mar. 29, 2015 USD ($)	Mar. 30, 2014 USD ($)	Mar. 29, 2015 USD ($)	Mar. 30, 2014 USD ($)	Mar. 26, 2015 Starbucks Coffee Japan Ltd Member	Dec. 29, 2014 Starbucks Coffee Japan Ltd Member USD ($)	Dec. 29, 2014 Starbucks Coffee Japan Ltd Member JPY (¥)	Oct. 31, 2014 Starbucks Coffee Japan Ltd Member USD ($)	Oct. 31, 2014 Starbucks Coffee Japan Ltd Member JPY (¥)	Mar. 29, 2015 Starbucks Coffee Japan Ltd Member USD ($)	Mar. 30, 2014 Starbucks Coffee Japan Ltd Member USD ($)		Mar. 29, 2015 Starbucks Coffee Japan Ltd Member USD ($)	Mar. 29, 2015 Starbucks Coffee Japan Ltd Member USD ($)	Mar. 30, 2014 Starbucks Coffee Japan Ltd Member USD ($)	Mar. 26, 2015 Starbucks Coffee Japan Ltd Member	Dec. 29, 2014 Starbucks Coffee Japan Ltd Member	Dec. 28, 2014 Starbucks Coffee Japan Ltd Member	Oct. 31, 2014 Starbucks Coffee Japan Ltd Member USD ($)	Oct. 26, 2014 Starbucks Coffee Japan Ltd Member	Sep. 28, 2014 Starbucks Coffee Japan Ltd Member	Oct. 31, 2014 Starbucks Coffee Japan Ltd Member Reacquired Rights USD ($)	Oct. 31, 2014 Starbucks Coffee Japan Ltd Member Licensing Agreements USD ($)	Oct. 31, 2014 Starbucks Coffee Japan Ltd Member Customer Loyalty Program USD ($)	Sep. 27, 2015 Starbucks Coffee Japan Ltd Member Scenario, Forecast [Member] USD ($)	Sep. 27, 2015 Starbucks Coffee Japan Ltd Member Scenario, Forecast [Member] JPY (¥)
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%		39.50%
Cash paid to acquire additional ownership interest in Starbucks Japan						$ 258.0	¥ 31,000.0	$ 508.7	¥ 55,000.0																$ 113.0	¥ 13,500.0
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%
Ownership interest after conclusion of Cash-out procedure					100.00%
Reference conversion rate										118.99			118.99	118.99			120.39			108.13
Acquisition-related costs incurred										0				11.3
Acquisition date								Oct. 31, 2014	Oct. 31, 2014
Definite-lived intangible assets acquired																						305.0	15.0	3.0
Definite-lived intangible assets, life (years)																						6 years 5 months	10 years 11 months	4 years 0 months
Definite-lived intangible assets, effect of foreign currency translation													29.5
Definite-lived intangible assets, amortization expense										11.3				19.0
Acquired definite-lived intangible assets, amortization expense, next twelve months										45			45	45
Acquired definite-lived intangible assets, amortization expense, year two										45			45	45
Acquired definite-lived intangible assets, amortization expense, year three										45			45	45
Acquired definite-lived intangible assets, amortization expense, year four										45			45	45
Acquired definite-lived intangible assets, amortization expense, year five										45			45	45
Acquired definite-lived intangible assets, amortization expense, after year five										50			50	50
Goodwill								815.6						741.2
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														74.4
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)				(0.4)
Gain resulting from acquisition of joint venture	0	0	390.6	0										390.6
Fair value of preexisting equity interest								577.0
Starbucks Japan revenue included in consolidated statements of earnings										291.3				484.1
Starbucks Japan net earnings included in consolidated statements of earnings										18.5				38.8
Pro forma revenue										4,563.5	4,152.4			9,458.5	8,679.1
Pro forma net earnings attributable to Starbucks										495.6	418.5	[1]		1,097.3	1,340.3
Transaction and integration costs										$ 0.6				$ 12.2

[1] The pro forma net earnings attributable to Starbucks for fiscal 2014 includes the acquisition-related gain of $390.6 million, and transaction and integration costs of $0.6 million and $12.2 million for the quarter and two quarters ended March 30, 2014, respectively.