v3.26.1
Intangible Assets and Goodwill - Key Assumptions Used in Impairment Testing (Details) - CAD ($)
$ in Thousands
Mar. 31, 2026
Jan. 01, 2026
Sep. 30, 2025
Mar. 31, 2025
Jan. 01, 2025
Disclosure of detailed information about intangible assets [line items]          
Carrying value, goodwill $ 26,651     $ 43,871  
Cannabis Operating Segment          
Disclosure of detailed information about intangible assets [line items]          
Carrying value, goodwill 26,700 $ 334,592   25,200 $ 341,777
Excess over carrying value   110,331     61,990
Australia Cannabis CGU          
Disclosure of detailed information about intangible assets [line items]          
Carrying value, Indefinite life intangible asset $ 0       14,338
Excess over carrying value     $ (13,216)    
Excess over carrying value         8,987
Plant Propagation CGU          
Disclosure of detailed information about intangible assets [line items]          
Carrying value, goodwill     149,041 $ 18,700  
Excess over carrying value     (37,202)    
Excess over carrying value     $ 18,500    
European Cannabis CGU          
Disclosure of detailed information about intangible assets [line items]          
Carrying value, Indefinite life intangible asset         40,869
Excess over carrying value   $ 7,592     $ 55,110
Intangible assets | Australia Cannabis CGU          
Disclosure of detailed information about intangible assets [line items]          
Terminal value growth rate     2.50%   3.00%
Discount rate     10.00%   10.30%
Fair value less cost to dispose     $ 1,158   $ 23,325
Carrying value, Indefinite life intangible asset     $ 14,374    
Intangible assets | Australia Cannabis CGU | Bottom of range          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin     (10.30%)   0.40%
Intangible assets | Australia Cannabis CGU | Top of range          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin     1.70%   3.70%
Intangible assets | European Cannabis CGU          
Disclosure of detailed information about intangible assets [line items]          
Terminal value growth rate   3.00%     3.00%
Discount rate   12.00%     13.30%
Fair value less cost to dispose   $ 61,867     $ 95,979
Carrying value, Indefinite life intangible asset   $ 54,275      
Intangible assets | European Cannabis CGU | Bottom of range          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin   0.20%     5.20%
Intangible assets | European Cannabis CGU | Top of range          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin   6.10%     11.40%
Goodwill | Cannabis Operating Segment          
Disclosure of detailed information about intangible assets [line items]          
Terminal value growth rate   2.50%     2.50%
Discount rate   15.30%     15.30%
Fair value less cost to dispose   $ 444,923     $ 403,767
Goodwill | Bottom of range | Cannabis Operating Segment          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin   14.00%     17.10%
Goodwill | Top of range | Cannabis Operating Segment          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin   23.80%     24.10%
Goodwill | Plant Propagation CGU          
Disclosure of detailed information about intangible assets [line items]          
Terminal value growth rate     2.50%    
Discount rate     10.90%    
Fair value less cost to dispose     $ 111,839    
Goodwill | Plant Propagation CGU | Bottom of range          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin     10.00%    
Goodwill | Plant Propagation CGU | Top of range          
Disclosure of detailed information about intangible assets [line items]          
EBITDA margin     21.70%