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Leases (Schedule Of Supplemental Cash Flow Related To Leases) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2019
Leases [Abstract] |  |  |
Cash paid for operating lease liabilities |  | $ 73,572 | $ 145,404
Operating lease assets obtained in exchange for operating lease liabilities | [1] | $ 64,807 | $ 2,466,046
[1] | Amounts for the six months ended June 30, 2019 include the transition adjustment for the adoption of Topic 842 discussed in Note 2. "Recent Accounting Standards".

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- Definition Operating lease assets obtained in exchange for operating lease liabilities. + References No definition available. + Details
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Namespace Prefix: | cmg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918643-209977 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(1) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration