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Subsequent Events - Additional Information (Detail) $ in Millions, $ in Millions			3 Months Ended
	Nov. 02, 2020 USD ($) shares	Nov. 02, 2020 CAD ($) shares	Mar. 31, 2019 shares	Nov. 02, 2020 CAD ($)	Sep. 30, 2020	Mar. 31, 2020
Subsequent Event [Line Items]
Equity ownership percentage						57.40%
Pure Sunfarms [Member]
Subsequent Event [Line Items]
Shares acquired accounted under equity method			25,000,000
Equity ownership percentage					58.70%
Pure Sunfarms [Member] \| Agreement [Member]
Subsequent Event [Line Items]
Shares acquired accounted under equity method	36,958,500	36,958,500
Equity ownership percentage	100.00%			100.00%
Purchase price	$ 60.0	$ 79.9
Cash paid for acquisition	45.0	$ 60.0
Promissory note payable	$ 14.5			$ 19.9
Notes payable due date	May 02, 2021	May 02, 2021