Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Apr. 23, 2021	Jun. 30, 2020
Document Information [Line Items]
Document Type	10-K/A
Entity Interactive Data Current	Yes
Amendment Flag	true
Document Period End Date	Dec. 31, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
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 Voluntary Filers	No
Entity Address, State or Province	BC
Entity Well-known Seasoned Issuer	Yes
Entity Public Float			$ 1,794,774,660
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	false
Amendment Description	This Amendment No. 2 on Form 10-K/A (this “Amendment”) amends the Annual Report on Form 10-K of Green Thumb Industries Inc. (the “Company,” “Green Thumb,” “we” or “us”) for our fiscal year ended December 31, 2020, filed with the Securities and Exchange Commission (the “SEC”) on March 18, 2021 (the “March 18 10-K”), and amended by Amendment No. 1 on Form 10-K/A filed with the SEC on March 19, 2021 (the “First Amendment” and the March 18 10-K as amended by the First Amendment is referred to herein as the “Original 10-K”). This Amendment is being filed solely for the purpose of including the information required by Part III of Form 10-K. At the time the Company filed the Original 10-K, it intended to file a definitive proxy statement for its 2021 Annual General Meeting of Shareholders within 120 days after the end of the 2020 fiscal year pursuant to Regulation 14A promulgated under the Securities Exchange Act of 1934, as amended. However, as the Company will not file the definitive proxy statement within such 120-day period, the information required by Part III (Items 10-14) of Form 10-K is filed herewith and provided below. As required by Rule 12b-15, in connection with this Amendment, the Company’s Chief Executive Officer and Chief Financial Officer are providing certifications pursuant to Rule 13a-14(a) as exhibits to this Form 10-K/A. Because no financial statements are contained with this Amendment, certifications pursuant to Section 906 of The Sarbanes-Oxley Act of 2002 are not included. Except as described above, this Amendment does not modify or update disclosure in, or exhibits to, the Original 10-K. Furthermore, this Amendment does not change any previously reported financial results, and we have not updated the disclosures contained in the Original 10-K to reflect any events that occurred subsequent to the date of the Original 10-K. The filing of this Amendment is not a representation that any statements contained in items of the Original 10-K other than Part III (Items 10-14) are true or complete as of any date subsequent to the Original Form 10-K.
Subordinate Voting Shares [Member]
Document Information [Line Items]
Title of 12(g) Security	Subordinate Voting Shares
Entity Common Stock, Shares Outstanding		185,423,900
Super Voting Shares [Member]
Document Information [Line Items]
Title of 12(g) Security	Super Voting Shares
Entity Common Stock, Shares Outstanding		30,103,100
Multiple Voting Shares [Member]
Document Information [Line Items]
Title of 12(g) Security	Multiple Voting Shares
Entity Common Stock, Shares Outstanding		3,965,400