Employee Compensation Plans (Details 4) (Deferred Cash Awards [Member])	12 Months Ended
Sep. 27, 2014
Minimum [Member]
Deferred cash awards ("DCAs")
Vesting period	3 years
Maximum [Member]
Deferred cash awards ("DCAs")
Vesting period	4 years

Represents the vesting period which is based solely on a service condition and is contingent upon the employee's continued employment and service rendered, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	gmcr_DeferredCompensationArrangementWithIndividualAwardVestingPeriod
Namespace Prefix:	gmcr_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration