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Earnings Per Share (Stock Awards Excluded From Calculation of Diluted EPS) (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Stock awards excluded, performance conditions	217	263	266
Stock awards excluded, anti-dilutive	1,695	1,316	289
Total stock awards excluded from diluted earnings per share	1,912	1,579	555

X

- Definition

Securities Excluded From Computation of Earnings Per Share Amount, Due to Performance Conditions

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Stock awards that were excluded from diluted earnings per share. For example, stock awards subject to performance conditions and stock awards that were antidilutive.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmg_
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Balance Type:	na
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X

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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X

- References

No definition available.

+ Details

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