Acquisitions and Divestitures (Details) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended
	Oct. 03, 2011	Oct. 31, 2011	Dec. 24, 2011	Sep. 24, 2011	Sep. 29, 2012
Divestiture
Gain on sale of subsidiary					$ 26,311,000
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Divestiture
Cash received on sale of subsidiary		149,500,000
Amount of cash transferred as part of sale of subsidiary		4,400,000
Payment made for settlement of contingency		7,400,000
Net cash inflow related to sale of subsidiary		137,700,000
Gain on sale of subsidiary			26,300,000
Revenues and net income of disposal group included in consolidated statement of operations
Net sales	2,286,000			90,855,000
Net income	229,000			12,263,000
Less income attributable to noncontrolling interests	20,000			1,051,000
Net income attributable to GMCR	209,000			11,212,000
Diluted net income per share (in dollars per share)				$ 0.07
Amount of sales not reflected in consolidated statement of operations				$ 22,200,000	$ 600,000