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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

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