Prepaid Expenses and Other Assets - Components of Prepaid and Other Assets (Details) - CAD ($) $ in Thousands	Sep. 30, 2022	Mar. 31, 2022
Prepaid Expense And Other Assets Current [Abstract]
Prepaid expenses	$ 40,679	$ 23,041
Deposits	8,482	10,145
Prepaid inventory	661	449
Other assets	13,135	19,065
Prepaid and other assets	$ 62,957	$ 52,700