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Revenue Recognition (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Gift card breakage revenue recognition period			8 months
Unredeemed gift card sales percentage	4.00%		4.00%
Chiptopia Summer Rewards [Member]
Revenue recognized from deferred liability	$ 0	$ 0	$ 0	$ 5,489

X

- Definition

Gift card breakage revenue recognition period

+ References

No definition available.

+ Details

Name:	cmg_GiftCardBreakageRevenueRecognitionPeriod
Namespace Prefix:	cmg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The Company's estimated breakage rate of gift card sales.

+ References

No definition available.

+ Details

Name:	cmg_UnredeemedGiftCardSalesPercentage
Namespace Prefix:	cmg_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130549-203045

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84173487&loc=SL51747714-108306

+ Details

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

X

- Details

Name:	us-gaap_ProductOrServiceAxis=cmg_ChiptopiaSummerRewardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: