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Subsequent Events - Additional Information (Details) $ / shares in Units, ft² in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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May 15, 2018 CAD ($) shares | May 09, 2018 CAD ($) shares | Apr. 23, 2018 CAD ($) $ / shares shares | Apr. 17, 2018 CAD ($) $ / shares | Apr. 15, 2018 CAD ($) shares | Jun. 30, 2018 CAD ($) $ / shares shares | Mar. 31, 2018 $ / shares shares | Mar. 31, 2017 $ / shares shares | May 17, 2018 CAD ($) shares | May 07, 2018 ft² | Feb. 07, 2018 shares | Sep. 07, 2017 shares | Dec. 12, 2016 shares | Mar. 31, 2016 shares
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  |  |  |  |  | $ 3.72 | $ 0.59 |  |  |  |  |  |
Number of common shares issued |  |  |  |  |  |  | 199,320,981 | 162,187,262 |  |  | 117,253 |  |  | 98,818,213
common shares issued |  |  |  |  |  |  |  |  |  |  |  | 111,366 | 490,641 |
Redemption price percentage if the note redeemde before the due date |  |  |  |  |  |  | 130.00% |  |  |  |  |  |  |
Redemption description of convertible senior notes |  |  |  |  |  |  | Canopy Growth may not redeem the notes prior to July 20, 2021, except in the event of certain changes in Canadian tax law. Canopy Growth may redeem for cash all or any portion of the notes, at its option, on or after July 20, 2021 if the last reported sale price of Canopy Growth’s common shares for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on the trading day immediately preceding the date on which Canopy Growth provides notice of redemption has been at least 130% of the conversion price then in effect on each such trading day. Redemptions of notes in either case shall be at a redemption price equal to 100% of the principal amount of the notes to be redeemed, plus accrued and unpaid interest to, but excluding, the redemption date. |  |  |  |  |  |  |
Daddy Cann Lesotho PTY Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ |  |  |  |  |  |  |  |  | $ 28,800,000 |  |  |  |  |
common shares issued |  |  |  |  |  |  |  |  | 999,643 |  |  |  |  |
Initial Share Issue | Daddy Cann Lesotho PTY Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
common shares issued |  |  |  |  |  |  |  |  | 666,362 |  |  |  |  |
Additional Shares Issued | Daddy Cann Lesotho PTY Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issued |  |  |  |  |  |  |  |  | 333,281 |  |  |  |  |
Subsequent Events |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Area of greenhouse | ft² |  |  |  |  |  |  |  |  |  | 1.2 |  |  |  |
Subsequent Events | Leasehold Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issued |  | 332,009 |  |  |  |  |  |  |  |  |  |  |  |
Common share, value | $ |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Loan to landlord | $ |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | LiveWell |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued by the strategic agreement |  |  |  |  | 5,487,642 |  |  |  |  |  |  |  |  |
Equity interest ownership percentage |  |  |  |  | 10.00% |  |  |  |  |  |  |  |  |
Number of shares placed in Escrow |  |  |  |  | 5,487,642 |  |  |  |  |  |  |  |  |
Subsequent Events | Good Leaf, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity interest ownership percentage |  |  | 8.80% |  |  |  |  |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  | $ 0.01 |  |  |  |  |  |  |  |  |  |  |
Warrants expiration description |  |  | 7 years |  |  |  |  |  |  |  |  |  |  |
Investment | $ |  |  | $ 5,478,000 |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | Good Leaf, Inc | Preference Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange of shares |  |  | 674,709 |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | Good Leaf, Inc | Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants to acquire shares of common stock |  |  | 139,432 |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | Canopy Health Innovations Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of common shares issued | 3,037,771 |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio per share | 0.3790 |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration | $ | $ 101,261,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | Canopy Health Innovations Inc. | Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of the shares issued for the transaction | $ | 91,573,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Events | Canopy Health Innovations Inc. | Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
In-the-money value of CHI options | $ | $ 9,688,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt Financing |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes issued | $ |  |  |  |  |  | $ 600,000,000 |  |  |  |  |  |  |  |
Convertible senior notes issued subject to over - allotment | $ |  |  |  |  |  | $ 100,000,000 |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.25% |  |  |  |  |  |  |  |
Convertible senior notes issued, convertion rate per $1 principal amount of notes |  |  |  |  |  | 20.7577 |  |  |  |  |  |  |  |
Convertible senior notes issued, initial convertion rate | $ / shares |  |  |  |  |  | $ 48.18 |  |  |  |  |  |  |  |
Convertible senior notes, maturity date |  |  |  |  |  | Jul. 15, 2023 |  |  |  |  |  |  |  |
Canopy Rivers | Subsequent Events | LiveWell |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares issued by the strategic agreement |  |  |  |  | 5,487,642 |  |  |  |  |  |  |  |  |
Debt financing maximum borrowing capacity | $ |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Canopy Rivers | Strategic Investment and Collaboration Agreement | Civilized Worldwide Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in debenture, convertible into common shares | $ |  |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |
Warrants exercise price | $ / shares |  |  |  | $ 3,500 |  |  |  |  |  |  |  |  |  |
Warrants expiration description |  |  |  | 24 month |  |  |  |  |  |  |  |  |  |

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