Other Financial Assets - Additional Information (Details) $ / shares in Units, $ in Thousands							12 Months Ended
	Mar. 11, 2020 CAD ($) Tranche $ / shares shares	Jun. 14, 2019 CAD ($) shares	May 01, 2019 CAD ($)	Nov. 30, 2018 CAD ($)	Nov. 01, 2018 Tranche	Dec. 08, 2017 CAD ($)	Mar. 31, 2020 CAD ($) $ / shares shares	Mar. 31, 2019 CAD ($)	Mar. 31, 2018 CAD ($) shares	Oct. 02, 2019 CAD ($)	Oct. 02, 2019 USD ($)	Jan. 14, 2019 CAD ($)	Nov. 27, 2017
Schedule Of Investments [Line Items]
Proceeds from exercise of warrants							$ 446,000	$ 18,790,000	$ 770,000
Loss from equity method investments							(64,420,000)	(10,752,000)	$ (1,473,000)
Investment in the exchangeable shares fair value initial recognition							135,000,000
Investment in the exchangeable shares fair value							$ 47,000,000	$ 160,000,000
Number of additional shares invested | shares									27,782,491
Number of tranches of warrants issued | Tranche					2
Canopy Rivers
Schedule Of Investments [Line Items]
Ownership percentage							27.30%	27.60%
Number of additional shares invested | shares							2,805,560
Other Income (Expense), Net
Schedule Of Investments [Line Items]
Gain loss on investment in the exchangeable share							$ (113,000,000)	$ 25,000,000
TerrAscend
Schedule Of Investments [Line Items]
Fair value of acquired shares						$ 13,460,000
Fair value of acquired warrants						$ 7,540,000
Ownership percentage													24.00%
Proceeds from exercise of warrants				$ 0
Loss from equity method investments				$ 8,678,000
TerrAscend Canada
Schedule Of Investments [Line Items]
Investment in subsidiary	$ 80,526,000
Number of tranches of warrants issued | Tranche	2
Investment transaction costs	$ 100,000
TerrAscend Canada | First Tranche
Schedule Of Investments [Line Items]
Warrants exercisable | shares	15,656,242
Warrant exercisable price per share | $ / shares	$ 5.41
Warrants exercisable description							They are exercisable upon the occurrence or waiver of TerrAscend the Triggering Event until the earliest of (i) March 10, 2030 and (ii) the later of (A) March 10, 2025 and (B) the date that is 24 months following the occurrence of the TerrAscend Triggering Event.
TerrAscend Canada | Second Tranche
Schedule Of Investments [Line Items]
Warrants exercisable | shares	2,152,733
Warrant exercisable price per share | $ / shares	$ 3.74
Warrants exercisable description							They are exercisable upon the occurrence or waiver of the TerrAscend Triggering Event until the earliest of (i) March 10, 2031 and (ii) the later of (A) March 10, 2026 and (B) the date that is 36 months following the occurrence of the TerrAscend Triggering Event.
TerrAscend Canada | Warrants
Schedule Of Investments [Line Items]
Investment in subsidiary	$ 25,626,000						$ 24,000,000
Number of additional shares invested | shares	17,808,975
TerrAscend Canada | Term Loan
Schedule Of Investments [Line Items]
Investment in subsidiary	$ 54,800,000						$ 44,300,000
TerrAscend Canada | Secured Debenture
Schedule Of Investments [Line Items]
Investment in subsidiary	$ 80,526,000
Debt instrument, maturity date, description							matures the earliest of (i) March 10, 2030 and (ii) the later of March 10, 2025 and the date that is 24 months following the date that is the TerrAscend Triggering Event.
Annual interest rate	6.10%
Debt instrument, frequency of periodic payment							annually
TerrAscend Canada | Canopy Rivers
Schedule Of Investments [Line Items]
Investment in subsidiary										$ 13,243,000	$ 10,000
TerrAscend Canada | Canopy Rivers | TerrAscend Warrants
Schedule Of Investments [Line Items]
Investment in subsidiary							$ 804,000			2,390,000
TerrAscend Canada | Canopy Rivers | Term Loan
Schedule Of Investments [Line Items]
Investment in subsidiary							9,520,000			$ 10,853,000
ZeaKal | Canopy Rivers
Schedule Of Investments [Line Items]
Preferred shares acquired | shares		248,473
Preferred shares acquired, value		$ 13,487,000
Percentage of equity interest		9.00%
Greenhouse
Schedule Of Investments [Line Items]
Value of shares to be exercised												$ 3,000,000
Exercise of rights as percentage of equity on fully diluted basis			26.00%
Increase in ownership interest			51.00%
Greenhouse | Greenhouse Unsecured Debenture Agreement
Schedule Of Investments [Line Items]
Investment in subsidiary			$ 3,000,000
Additional investments and advances committed to be made to affiliates												3,000,000
Greenhouse | Canopy Rivers | Greenhouse Secured Debenture Agreement
Schedule Of Investments [Line Items]
Investment in subsidiary												$ 6,000,000
SLANG
Schedule Of Investments [Line Items]
Estimated fair value of warrants							3,500,000	44,000,000
Estimated gain (loss) of warrant							$ 40,500,000	$ 4,000,000
SLANG | Exercise Price of One Dollar
Schedule Of Investments [Line Items]
Right to acquire shares | shares							31,619,975
SLANG | Exercise Price of $1.50 Per Share
Schedule Of Investments [Line Items]
Right to acquire shares | shares							11,602,370
Exercise price | $ / shares							$ 1.50
SLANG | Exercise Price of $2.25 Per Share
Schedule Of Investments [Line Items]
Right to acquire shares | shares							5,801,184
Exercise price | $ / shares							$ 2.25