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Income taxes - Income Tax Expense (Recovery) Reconciliation Canada (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Disclosure Of Income Tax [Abstract]    
Loss before income taxes $ (160,488) $ (1,074,228)
Income tax recovery at the statutory tax rate (42,529) (284,671)
Impact of rate differential of foreign jurisdiction 8,303 9,944
Non-deductible share-based compensation and related costs 14,048 33,771
Acquisition-related compensation and transaction-related costs 575 1,267
Other non-deductible expenses and non-taxable amounts 742 728
Adjustment related to prior years 1,089 (761)
Goodwill impairment 0 198,409
Changes in unrecognized benefits of deferred tax assets 19,493 38,673
Impact of foreign exchange and other 1,755 (1,579)
Total income tax expense (recovery) $ 3,476 $ (4,219)