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Commitments and Contingencies (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
Commitments and Contingencies [Abstract]
Data breach pretax expense	$ 30,000

X

- Definition

Pretax amount of expenses recorded related to a breach of the company's payment data systems.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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