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Financial Assets and Liabilities - Summary of Prepayments (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Jun. 30, 2022
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Disclosure Of Financial Assets And Liabilities [Abstract] |  |
Clinical trial research and development expenditure | $ 1,283 | $ 1,313
Prepaid insurance and subscriptions | 1,051 | 2,420
Other | 1,261 | 1,254
Prepayments | $ 3,595 | $ 4,987

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- Definition Receivables that represent amounts paid for goods and services before they have been delivered. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 78 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_b&doctype=Standard -URIDate 2022-03-24 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of asset related to consideration paid in advance for clinical trial research and development expenses. + References No definition available. + Details
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Namespace Prefix: | meso_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Disclosure of financial assets and liabilities abstract. + References No definition available. + Details
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Namespace Prefix: | meso_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Other prepayments. + References No definition available. + Details
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Namespace Prefix: | meso_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Prepaid insurance and subscriptions. + References No definition available. + Details
Name: | meso_PrepaidInsuranceAndSubscriptions
Namespace Prefix: | meso_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant