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Short-term Investments - Components of Short-term Investments (Details) - CAD ($)
$ in Thousands
Dec. 31, 2022
Mar. 31, 2022
Marketable Securities [Line Items]    
Short-term investments $ 191,119 $ 595,651
Term Deposits    
Marketable Securities [Line Items]    
Short-term investments 98,286 319,092
Asset-backed Securities    
Marketable Securities [Line Items]    
Short-term investments 80,924 21,905
Government securities    
Marketable Securities [Line Items]    
Short-term investments   22,253
Commercial Paper and Other    
Marketable Securities [Line Items]    
Short-term investments $ 11,909 $ 232,401