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Commitments and Contingencies (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($)
Commitments and Contingencies [Abstract] |
Data breach pretax expense | $ 29,289

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