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Segment Information - Summary of Disaggregation of Property, Plant and Equipment by Geographic Area (Details) - CAD ($)
$ in Thousands
Jun. 30, 2026
Mar. 31, 2026
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment $ 311,203 $ 316,494
CANADA    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment 260,674 265,362
Germany    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment 49,896 50,406
Other    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment $ 633 $ 726