Property, Plant and Equipment - Additional Information (Details) - CAD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Property Plant And Equipment [Line Items]
Depreciation of property, plant and equipment			$ 29,608	$ 37,108
Costs Recorded in Cost of Goods Sold
Property Plant And Equipment [Line Items]
Depreciation of property, plant and equipment	$ 11,316	$ 14,388	22,390	24,850
Selling, General and Administrative Expenses
Property Plant And Equipment [Line Items]
Depreciation of property, plant and equipment	$ 3,163	$ 5,604	$ 7,218	$ 12,258