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Shareholders' Equity (Narrative) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Feb. 19, 2013	Nov. 20, 2012	Feb. 03, 2015
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount	$ 800,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
Acquisition of treasury stock (value), total	88,338us-gaap_TreasuryStockValueAcquiredCostMethod	138,903us-gaap_TreasuryStockValueAcquiredCostMethod	217,092us-gaap_TreasuryStockValueAcquiredCostMethod
Value of common shares remaining to be repurchased	102,210us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, additional authorized amount						100,000cmg_StockRepurchaseProgramAdditionalAuthorizedAmount / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Accelerated Share Repurchase Transaction [Member]
Equity, Class of Treasury Stock [Line Items]
Stock repurchase program, authorized amount					25,000us-gaap_StockRepurchaseProgramAuthorizedAmount1 / us-gaap_ShareRepurchaseProgramAxis = cmg_AcceleratedShareRepurchaseTransactionMember
Acquisition of treasury stock (shares)				22us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_AcceleratedShareRepurchaseTransactionMember	65us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_AcceleratedShareRepurchaseTransactionMember
Percentage of treasury shares acquired					70.00%cmg_PercentageOfTreasurySharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_AcceleratedShareRepurchaseTransactionMember
Weighted-average price per share				$ 287.20us-gaap_TreasuryStockAcquiredAverageCostPerShare / us-gaap_ShareRepurchaseProgramAxis = cmg_AcceleratedShareRepurchaseTransactionMember
Advance payment under agreement					25,000us-gaap_AcceleratedShareRepurchasesSettlementPaymentOrReceipt / us-gaap_ShareRepurchaseProgramAxis = cmg_AcceleratedShareRepurchaseTransactionMember
Repurchases in Accordance with Stock Award Agreements [Member]
Equity, Class of Treasury Stock [Line Items]
Acquisition of treasury stock (shares)	1us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_NotPartOfShareRepurchasePlanMember	57us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_NotPartOfShareRepurchasePlanMember	28us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_NotPartOfShareRepurchasePlanMember
Acquisition of treasury stock (value), total	342us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = cmg_NotPartOfShareRepurchasePlanMember	28,916us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = cmg_NotPartOfShareRepurchasePlanMember	10,698us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = cmg_NotPartOfShareRepurchasePlanMember
Share Repurchase Plans, including Accelerated Share Repurchase [Member]
Equity, Class of Treasury Stock [Line Items]
Acquisition of treasury stock (shares)	154us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_ShareRepurchaseProgramMember	336us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_ShareRepurchaseProgramMember	686us-gaap_TreasuryStockSharesAcquired / us-gaap_ShareRepurchaseProgramAxis = cmg_ShareRepurchaseProgramMember
Acquisition of treasury stock (value), total	$ 87,996us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = cmg_ShareRepurchaseProgramMember	$ 109,987us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = cmg_ShareRepurchaseProgramMember	$ 206,394us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_ShareRepurchaseProgramAxis = cmg_ShareRepurchaseProgramMember

X

- Definition

Represents percentage of shares repurchased during the period of the total number of shares to be repurchased calculated using the closing price on the commencement date.

+ References

No definition available.

+ Details

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Namespace Prefix:	cmg_
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X

- Definition

Stock repurchase program, additional authorized amount

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Amount of cash receipt from (payment to) bank; or stock received from (issuance to) bank in the settlement of the accelerated share repurchase agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 25

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653

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- Definition

Amount of stock repurchase plan authorized.

+ References

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+ Details

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X

- Definition

Amount remaining of a stock repurchase plan authorized.

+ References

No definition available.

+ Details

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X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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X

- Definition

Number of shares that have been repurchased during the period and are being held in treasury.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30

-Article 5

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- Definition

Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770



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-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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