v3.25.4

Property, Plant and Equipment - Summary of Depreciations Charges (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of detailed information about depreciations charges [Line Items] |  |  |
Depreciations charges | € 17,206 | € 17,247 | € 18,428
Cost of sales [member] |  |  |
Disclosure of detailed information about depreciations charges [Line Items] |  |  |
Depreciations charges | 1,835 | 3,197 | 2,509
Research and development expenses [member] |  |  |
Disclosure of detailed information about depreciations charges [Line Items] |  |  |
Depreciations charges | 8,468 | 7,453 | 10,296
Selling General And Administrative Expense [Member] |  |  |
Disclosure of detailed information about depreciations charges [Line Items] |  |  |
Depreciations charges | € 6,903 | € 6,597 | € 5,623

X
- References No definition available. + Details
Name: | asnd_DisclosureOfDetailedInformationAboutDepreciationsChargesLineItems
Namespace Prefix: | asnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 73 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_73_e_vii&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2025-01-01 -Paragraph 75 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2025-en-r&anchor=para_75_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 200 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_200_e_vii&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 200 -Subparagraph e -Clause vii -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_200_e_vii&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_DepreciationPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | asnd_StatementOfComprehensiveIncomeProfitOrLossLocationAxis=ifrs-full_CostOfSalesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asnd_StatementOfComprehensiveIncomeProfitOrLossLocationAxis=asnd_ResearchAndDevelopmentExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | asnd_StatementOfComprehensiveIncomeProfitOrLossLocationAxis=ifrs-full_SellingGeneralAndAdministrativeExpenseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |