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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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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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