Product Warranties (Details) (USD $)	3 Months Ended	6 Months Ended
Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Product Warranties
Period of warranty on Keurig hot beverage system brewers			1 year
Changes in carrying amount of product warranties
Balance, beginning of period	$ 19,680,000us-gaap_ProductWarrantyAccrual	$ 12,791,000us-gaap_ProductWarrantyAccrual	$ 12,850,000us-gaap_ProductWarrantyAccrual	$ 7,804,000us-gaap_ProductWarrantyAccrual
Provision related to current period	5,795,000	4,834,000	19,961,000	15,064,000
Change in estimate	1,079,000	(2,425,000)	1,079,000	(2,483,000)
Usage	(8,627,000)us-gaap_ProductWarrantyAccrualPayments	(6,675,000)us-gaap_ProductWarrantyAccrualPayments	(15,963,000)us-gaap_ProductWarrantyAccrualPayments	(11,860,000)us-gaap_ProductWarrantyAccrualPayments
Balance, end of period	17,927,000us-gaap_ProductWarrantyAccrual	8,525,000us-gaap_ProductWarrantyAccrual	17,927,000us-gaap_ProductWarrantyAccrual	8,525,000us-gaap_ProductWarrantyAccrual
Recoveries	$ 500,000gmcr_ProductWarrantyAccrualRecoveries	$ 200,000gmcr_ProductWarrantyAccrualRecoveries	$ 700,000gmcr_ProductWarrantyAccrualRecoveries	$ 700,000gmcr_ProductWarrantyAccrualRecoveries

Represents the reduction to warranty expense for recoveries from suppliers.

No definition available.

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Namespace Prefix:	gmcr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Represents the period of warranty offered by the entity for standard and extended product warranties.

+ References

No definition available.

+ Details

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- Details

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Namespace Prefix:	us-gaap_
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- Details

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Balance Type:	na
Period Type:	duration

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.15(5))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 15

-Subparagraph 5

-Article 9

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(5))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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

- Definition

Represents the aggregate decrease in the liability related to payments to satisfy claims for standard and extended product warranties.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(2))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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

- Definition

Represents the aggregate Increase or Decrease in the liability during the reporting period for accruals related to preexisting standard and extended product warranties (including adjustments for changes in estimates).

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(4))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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

Represents the aggregate increase in the liability for accruals related to standard and extended product warranties issued during the reporting period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 8

-Subparagraph ((c)(3))

-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

+ Details

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Balance Type:	credit
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