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Earnings Per Share - Summary of Earnings and Share Data Used in the Basic and Diluted Earnings Per Share Calculation (Parenthetical) (Detail) - shares | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Convertible Senior Notes [Member] |  |
Earnings per share [line items] |  |
Convertible notes | 575,000 | 575,000
Ordinary shares [member] |  |
Earnings per share [line items] |  |
Warrants outstanding | 3,456,785 | 3,456,785

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- Definition Number of warrants outstanding. + References No definition available. + Details
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Namespace Prefix: | asnd_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Potential conversion of convertible senior notes into number of ordinary shares. + References No definition available. + Details
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Namespace Prefix: | asnd_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_EarningsPerShareLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | asnd_AntidilutiveSecuritiesNotIncludedInDilutedEarningsPerShareAxis=asnd_ConvertibleSeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |