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Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Sep. 29, 2012	Jun. 23, 2012	Mar. 24, 2012	Dec. 24, 2011	Sep. 24, 2011	Jun. 25, 2011	Mar. 26, 2011	Dec. 25, 2010	Sep. 25, 2010	Jun. 26, 2010	Mar. 27, 2010	Dec. 26, 2009	Sep. 29, 2012	Sep. 24, 2011	Sep. 25, 2010
Numerator for basic and diluted earnings per share:
Net income attributable to GMCR													$ 362,628	$ 199,501	$ 79,506
Denominator:
Basic weighted average shares outstanding													154,933,948	146,214,860	131,529,412
Effect of dilutive securities - stock options (in shares)													4,141,698	5,927,574	6,304,711
Diluted weighted average shares outstanding													159,075,646	152,142,434	137,834,123
Basic and diluted net income per common share
Basic net income per common share (in dollars per share)	$ 0.59	$ 0.47	$ 0.60	$ 0.67	$ 0.49	$ 0.38	$ 0.46	$ 0.02	$ 0.20	$ 0.14	$ 0.18	$ 0.08	$ 2.34	$ 1.36	$ 0.60
Diluted net income per common share (in dollars per share)	$ 0.58	$ 0.46	$ 0.58	$ 0.66	$ 0.47	$ 0.37	$ 0.44	$ 0.02	$ 0.20	$ 0.13	$ 0.17	$ 0.07	$ 2.28	$ 1.31	$ 0.58
Diluted earnings per share, other disclosure
Antidilutive securities excluded from computation of earnings per share (in shares)													763,000	199,000	318,000