Cover Page - shares	9 Months Ended
	Sep. 30, 2020	Nov. 05, 2020
Document Information [Line Items]
Document Type	10-Q
Entity Interactive Data Current	Yes
Amendment Flag	false
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Entity Registrant Name	GREEN THUMB INDUSTRIES INC.
Entity Central Index Key	0001795139
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Address, State or Province	BC
Subordinate Voting Shares [Member]
Document Information [Line Items]
Title of 12(g) Security	Subordinate Voting Shares
Entity Common Stock, Shares Outstanding		175,040,286
Multiple Voting Shares [Member]
Document Information [Line Items]
Title of 12(g) Security	Multiple Voting Shares
Entity Common Stock, Shares Outstanding		6,779,300
Super Voting Shares [Member]
Document Information [Line Items]
Title of 12(g) Security	Super Voting Shares
Entity Common Stock, Shares Outstanding		31,203,100