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Stock Based Compensation (Changes in Awards Expected to Vest) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-Based Compensation [Abstract]
Change in estimate expense non-vested stock awards	$ (79)	$ (1,410)	$ (6,031)
Change in estimate expense non-vested stock awards, net of tax	$ (58)	$ (857)	$ (3,332)
Change in accounting estimate non vested stock awards basic earnings per share		$ 0.03	$ 0.11
Change in accounting estimate non vested stock awards diluted earnings per share		$ 0.03	$ 0.11

X

- Definition

The basic per share expense during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest.

+ References

No definition available.

+ Details

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- Definition

The diluted per share expense during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest.

+ References

No definition available.

+ Details

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- Definition

Expense recognized during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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X

- Definition

Expense, net of income tax, recognized during the period resulting from the change in estimate of the number of non-vested stock awards subject to performance conditions that is expected to vest.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- References

No definition available.

+ Details

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