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Income taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disclosure of income taxes [Line Items]
Deductible temporary differences	$ 63,695	$ 60,237
Research and development expense, available for reduction of future taxable income	21,760	15,456
With expiry
Disclosure of income taxes [Line Items]
Deductible temporary differences	320,344	226,403
No expiry
Disclosure of income taxes [Line Items]
Deductible temporary differences	267,063	167,664
Research and development
Disclosure of income taxes [Line Items]
Research and development expenditures	2,598	2,548
E-business
Disclosure of income taxes [Line Items]
Research and development expenditures	4,823	3,772
Canada
Disclosure of income taxes [Line Items]
Provision for tax refund receivable	$ 4,077	$ 3,933

X

- Definition

The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Number 12
-IssueDate 2022-03-24
-Paragraph 81
-Subparagraph e
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-URIDate 2022-03-24

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- Definition

The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Disclosure Of Income Taxes

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- Definition

Research And Development Expense, Available For Reduction Of Future Taxable Income Not Subject To Expiration

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