Basis of Presentation (Narrative) (Details)	6 Months Ended	9 Months Ended
	Jun. 30, 2018 region	Sep. 30, 2018 segment item region
Product Information [Line Items]
Number of regions | region	9	8
Number of reportable segments | segment		1
Pizzeria Locale [Member]
Product Information [Line Items]
Number of restaurants		2
United States [Member] | Chipotle [Member]
Product Information [Line Items]
Number of restaurants		2,424
International [Member] | Chipotle [Member]
Product Information [Line Items]
Number of restaurants		37