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Segment Information - Summary of Disaggregation of Property, Plant and Equipment by Geographic Area (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Mar. 31, 2022
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment $ 874,029 $ 942,780
CANADA    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment 726,613 827,591
United States    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment 96,159 63,247
Other    
Revenues From External Customers And Long Lived Assets [Line Items]    
Property, plant and equipment $ 51,257 $ 51,942