Commitments Contigencies (Details Narrative)				1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
Commitments Contigencies (Details Narrative)	Mar. 15, 2021 USD ($) shares	Jan. 15, 2021 shares	Sep. 13, 2020 USD ($) shares	Nov. 15, 2020 $ / shares shares	Apr. 20, 2020 shares	Apr. 30, 2021 USD ($)	Apr. 30, 2021 USD ($) shares	Jul. 31, 2021 USD ($) ft² shares	Jul. 31, 2020 USD ($) shares	Mar. 10, 2021 shares	Sep. 21, 2020 shares
Stock-based compensation expense \| $								$ 4,748,058	$ 3,024,160
Common stock issued				100,000	50,000			50,000	50,000
Consulting Agreement [Member]
Restricted shares issued		200,000
Restricted shares issued description		The first 100,000 shares were issued on the effective date and the remaining 100,000 shares are to be issued at the beginning of the third month from the effective date.
Consulting Agreement [Member] \| September 21, 2020 [Member]
Common stock issued							200,000
Consulting Agreement [Member] \| March 1, 2021 [Member]
Stock-based compensation expense \| $						$ 15,125	$ 15,125
Restricted shares issued								25,000
Consulting agreement description							Each year, the first 12,500 shares are to be issued on the effective date and subsequent anniversary dates and an additional 12,500 shares are to be issued six (6) months thereafter.
Initial shares							12,500
Consulting fee per hour \| $							$ 75
Consulting Agreement [Member] \| February 1, 2020 [Member]
Restricted shares issued								100,000			100,000
Stock issuable								50,000
GHS Investments LLC [Member] \| Financing Agreement [Member]
Restricted shares issued			150,857
Purchased aggregate fair value \| $			$ 25,000,000
Common stock restricted shares			150,857
Commitment shares			150,857
Common stock shares value \| $			$ 25,000,000
Closing price description			The Company will sell shares of its common stock to GHS at a price equal to 100% of the lowest closing price of the Company’s common stock during the ten (10) consecutive trading day period ending on the date on which it delivers a put notice to GHS (the “Market Price”), and the Company will be obligated to simultaneously deliver the number of shares equal to120% of the put notice amount based on the Market Price. In addition, the Financing Agreement (i) imposes an ownership limitation on GHS of 4.99% (i.e., GHS has no obligation to purchase shares if it beneficially owns more than 4.99% of our common stock), (ii) requires a minimum of ten (10) trading days between put notices, and (iii) prohibits any single Put Amount from exceeding $500,000.
Exceeding amount \| $			$ 500,000
Ralph Olson [Member] \| July 23, 2020 [Member]
Consulting agreement description							The shares are to be issued in quarterly installments of 125,000 beginning on the Effective Date and every 90 days thereafter. The initial 125,000 shares were issued on September 21, 2020. Pursuant to the terms of the agreement, the Company terminated the agreement on October 21, 2020
Consulting fee per month \| $							$ 6,000
Restricted shares to be issued							500,000
Dylan Piccolo [Member] \| Consulting Agreement [Member]
Stock-based compensation expense \| $						130,000	$ 130,000
Restricted shares issued	100,000
Initial shares	100,000
David Mapley [Member] \| Consulting Agreement [Member]
Stock-based compensation expense \| $						130,000	130,000
Restricted shares issued	100,000
Initial shares	100,000
Biome Sciences [Member] \| Consulting Agreement [Member]
Stock-based compensation expense \| $						65,000	65,000
Restricted shares issued	100,000
Consulting agreement description	50,000 shares are to be issued on the date of the agreement and 50,000 shares are to be issued on the six- month anniversary of the agreement.
Initial shares	50,000
Matthew Schwaigert [Member] \| Consulting Agreement [Member]
Stock-based compensation expense \| $						130,000	130,000
Consulting fee per month \| $	$ 7,500
Restricted shares issued	100,000
Consulting agreement description	100,000 shares of restricted common stock on the six-month anniversary of the agreement
Initial shares	100,000
Assistant Agricultural Operations Manager [Member] \| August 1, 2019 [Member]
Consulting fee per month \| $							$ 2,000
Restricted shares issued								25,000
Common stock issued							25,000
Signing bonus \| $							$ 4,000
Maturity period							6 months
Assistant Agricultural Operations Manager [Member] \| September 21, 2020 [Member]
Common stock issued							25,000
Boustead Securities LLC [Member] \| September 18, 2020 [Member]
Restricted shares issued											250,000
Restricted value \| $								$ 187,500
Boustead Securities LLC [Member] \| September 21, 2020 [Member]
Common stock issued							250,000
Chief Project Manager [Member] \| August 1, 2019 [Member]
Restricted shares issued								300,000
Common stock issued							200,000
Consulting fee per month \| $							$ 7,500
Maturity period							5 years
Agreement to pay bonus \| $							$ 15,000
Chief Project Manager [Member] \| September 21, 2020 [Member]
Common stock issued							100,000
Joseph D. Kowal [Member] \| July 23, 2020 [Member]
Consulting agreement description							The shares are to be issued in quarterly installments of 125,000 beginning on the Effective Date and every 90 days thereafter. The initial 125,000 shares were issued on September 21, 2020. Pursuant to the terms of the agreement, the Company terminated the agreement on October 21, 2020
Consulting fee per month \| $							$ 6,000
Restricted shares to be issued							500,000
February 1, 2021 [Member] \| Ralph Olson [Member]
Consulting fee per month \| $							$ 6,000
Restricted shares issued								125,000
February 1, 2021 [Member] \| Daniel Claycamp [Member]
Stock-based compensation expense \| $						44,500	$ 44,500
Restricted shares issued	260,000							100,000		200,000
Consulting agreement description							50,000 shares were due upon the signing of the agreement and 50,000 shares to be issued on the six- month anniversary of the agreement.
Initial shares							50,000
February 1, 2021 [Member] \| Jason Smithson [Member]
Stock-based compensation expense \| $						$ 32,500	$ 32,500
Restricted shares issued								25,000
Initial shares							50,000
March 1, 2021 [Member] \| Purchase and Sale Agreement [Member]
Area of building \| ft²								37,530
Cash payment of agreement \| $							$ 7,500,000
Restricted common shares								300,000
September 1, 2018 [Member] \| Consulting Agreement [Member]
Consulting fee per month \| $							$ 2,500
Consulting agreement description							The agreement can be extended to four years upon mutual agreement. Upon completion of a minimum $1,000,000 financing, the Company will increase this payment to $5,000 per month. Upon completion of a minimum $5,000,000 financing or profitable operations
Term of agreement							2 years
Frequency of periodic payments							Monthly
December 1, 2020 [Member] \| Heidi Thomassen [Member] \| Consulting Agreement [Member]
Consulting fee per month \| $							$ 5,000
Restricted shares issued								100,000
Restricted shares issued description							100,000 shares of restricted common stock annually. Each year, the first 50,000 shares are to be issued on the effective date and subsequent anniversary dates and an additional 50,000 shares are to be issued six (6) months thereafter.
December 1, 2020 [Member] \| Consultant [Member]
Restricted shares issued								50,000
August 1, 2019 [Member] \| Consulting Agreement [Member]
Restricted shares issued								125,000
August 1, 2019 [Member] \| CEO [Member]
Restricted shares issued								375,000
Term of agreement							3 years
Common stock issued							250,000
Additional shares issued							250,000
Consulting fee per month \| $							$ 7,500
September 1, 2020 [Member] \| Consulting Agreement [Member]
Restricted shares issued											50,000
August 18, 2020 [Member] \| Non-Related Third Party [Member]
Restricted shares issued				125,000
Consulting fee per month \| $							$ 5,000
Price per share \| $ / shares				$ 0.60
February 13, 2020 [Member] \| Todd Mueller [Member] \| Consulting Agreement [Member]
Restricted shares issued											50,000
Consulting agreement description							The Company agreed to pay a consulting fee of 100,000 shares, 50,000 shares would be delivered upon the execution of the agreement (certificated on July 14, 2020) and 50,000 delivered in six months based on the continuation of the agreement.
Term of agreement							5 years
Share issued for services							100,000
Shares issued in first installment							50,000
Shares issued in second installment							50,000
November 15, 2019 [Member] \| Kyle MacKinnon [Member]
Restricted shares issued				100,000				200,000
Consulting fee per month \| $							$ 7,500
Shares description							Each year, the first 100,000 shares are to be issued on the Effective Date and subsequent anniversary dates and an additional 100,000 shares are to be issued six (6) months thereafter.
November 15, 2019 [Member] \| Independent Director [Member]
Common stock issued					50,000		100,000
Stock issuable								50,000
Stock payable value \| $								$ 100,000
August 1, 2020 [Member] \| Dr. Darjania [Member] \| Employment Agreement [Member]
Shares description							The issuance of 200,000 shares of common stock, of which 100,000 vested on the Effective Date and 100,000 vest six (6) months from the Effective Date. The initial 100,000 shares were issued on September 21, 2020.
Annual base salary \| $							$ 250,000
Common stock shares issuable upon exercise of options								200,000
Common stock shares vested								100,000

GREEN HYGIENICS HOLDINGS INC. 10-K