Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Dec. 28, 2013	Dec. 29, 2012
Numerator for basic and diluted earnings per share:
Net income attributable to GMCR	$ 138,227	$ 107,583
Denominator:
Basic weighted average shares outstanding	149,162,600	149,317,597
Effect of dilutive securities (in shares)	2,419,297	3,391,210
Diluted weighted average shares outstanding	151,581,897	152,708,807
Basic and diluted net income per common share
Basic net income per common share (in dollars per share)	$ 0.93	$ 0.72
Diluted net income per common share (in dollars per share)	$ 0.91	$ 0.70
Diluted earnings per share, other disclosure
Antidilutive securities excluded from computation of earnings per share (in shares)	483,400	1,416,402