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Cash and Cash Equivalents - Components of Cash and Cash Equivalents (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Mar. 31, 2022
Cash And Cash Equivalents [Abstract]    
Cash $ 524,979 $ 470,682
Cash equivalents 73,152 305,323
Cash and cash equivalents $ 598,131 $ 776,005