Segment Information - Summary of Disaggregation of Property, Plant and Equipment by Geographic Area (Details) - CAD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment	$ 864,523	$ 942,780
CANADA
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment	747,355	827,591
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment	$ 117,168	$ 115,189