Name:	gmcr_AcceleratedStockRepurchasesInitialDeliveryOfSharesValueAsPercentageOfAuthorizedValue
Namespace Prefix:	gmcr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

The number of additional shares that would have been issued if the contract had been settled as of the balance sheet date.

No definition available.

Name:	gmcr_ForwardContractIndexedToIssuersEquitySharesProForma
Namespace Prefix:	gmcr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Equity impact of the value of stock that has been repurchased during the period but held back pending the final settlement under an accelerated share repurchase agreement.

No definition available.

Name:	gmcr_StockRepurchasedDuringPeriodAndHeldPendingSettlementOfAcceleratedShareRepurchase
Namespace Prefix:	gmcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Represents the average price per share of shares acquired under the stock repurchase program.

No definition available.

Name:	gmcr_StockRepurchaseProgramAveragePricePerShareOfAcquiredShares
Namespace Prefix:	gmcr_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

Aggregate number of shares that have been repurchased during the period, without regard to whether the shares have been retired, are held in treasury, or are being held back pending finalization of an accelerated share repurchase program.

No definition available.

Name:	gmcr_StockRepurchasesDuringPeriodAggregateShares
Namespace Prefix:	gmcr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Aggregate equity impact of the value of stock that has been repurchased during the period, without regard to whether the stock has been retired, is held in treasury, or is being held back pending finalization of an accelerated share repurchase program.

No definition available.

Name:	gmcr_StockRepurchasesDuringPeriodAggregateValue
Namespace Prefix:	gmcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_ClassOfStockLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The maximum number of shares that could be issued to net share settle a contract, if applicable. If a contract does not have a fixed or determinable maximum number of shares that may be required to be issued, disclose the fact that a potentially infinite number of shares could be issued to settle the contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 40

-Section 50

-Paragraph 5

-Subparagraph (b)(2)

-URI http://asc.fasb.org/extlink&oid=6445032&loc=d3e90205-114008

Name:	us-gaap_ForwardContractIndexedToIssuersEquityShares
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The cash outflow to reacquire common stock during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

Name:	us-gaap_PaymentsForRepurchaseOfCommonStock
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

Name:	us-gaap_StockRepurchasedAndRetiredDuringPeriodValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount remaining of a stock repurchase plan authorized.

No definition available.

Name:	us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_AdditionalPaidInCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: