Inventories (Details 2) $ in Millions	Dec. 26, 2015 USD ($) $ / lb
Green coffee purchase commitments
Purchase commitments
Amount of purchase commitment	$ 224.6
Percentage of purchase commitment that has a fixed price	88.00%
Average C price of coffee per pound used to calculate variable portion of purchase commitment (in dollars per pound) \| $ / lb	1.26
Brewer and related accessory purchase commitments
Purchase commitments
Amount of purchase commitment	$ 263.5
Production raw material commitments
Purchase commitments
Amount of purchase commitment	$ 864.9

Represents the average "C" price of coffee used to calculate the variable portion of the unrecorded unconditional purchase obligation.

No definition available.

+ Details

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Namespace Prefix:	gmcr_
Data Type:	us-types:perUnitItemType
Balance Type:	na
Period Type:	instant

- Definition

Represents the percentage of the unrecorded unconditional purchase obligation that has a fixed price.

+ References

No definition available.

+ Details

Name:	gmcr_UnrecordedUnconditionalPurchaseObligationPercentageWithFixedPrice
Namespace Prefix:	gmcr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25336-109308

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Balance Type:	na
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- Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=gmcr_GreenCoffeeMember
Namespace Prefix:
Data Type:	na
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- Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=gmcr_BrewerInventoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationByCategoryOfItemPurchasedAxis=gmcr_ProductionRawMaterialsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: