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Income taxes - Unrecognized tax assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Disclosure Of Income Tax [Abstract]
Deductible temporary differences	$ 63,695	$ 60,237
Non-capital losses	587,407	394,067
Research and development expense, available for reduction of future taxable income	21,760	15,456
Unrecognized tax assets	$ 672,862	$ 469,760

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
-Name IAS
-Number 12
-IssueDate 2022-03-24
-Paragraph 81
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2022-03-24

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2022-03-24
-Paragraph 81
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2022-en-r&anchor=para_81_e&doctype=Standard
-URIDate 2022-03-24

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X

- Definition

Disclosure Of Income Tax [Abstract]

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

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X

- Definition

Unrecognized Tax Benefits

+ References

No definition available.

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