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Leases (Schedule Of Supplemental Cash Flow Related To Leases) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Leases [Abstract]
Cash paid for operating lease liabilities	$ 71,832
Operating lease assets obtained in exchange for operating lease liabilities	$ 2,401,239	[1]
[1] Amounts for the three months ended March 31, 2019 include the transition adjustment for the adoption of Topic 842 discussed in Note 2. "Accounting Policies."

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- Definition

Operating lease assets obtained in exchange for operating lease liabilities.

+ References

No definition available.

+ Details

Name:	cmg_OperatingLeaseAssetsObtainedInExchangeForOperatingLeaseLiabilities
Namespace Prefix:	cmg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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

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- Definition

Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980

+ Details

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