v3.25.4

Share-Based Payment - Summary Of Share Based Payment (Parenthetical) (Detail) - EUR (€) | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Restricted Stock Units and Performance Stock Unit [Member] |  |  |
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items] |  |  |
Fair Value of Other Equity Instruments Granted | € 150.4 | € 141.01 | € 105.96

X
- Definition Share-based payment arrangement, restricted stock unit, activity. + References No definition available. + Details
Name: | asnd_SharebasedPaymentArrangementRestrictedStockUnitActivityLineItems
Namespace Prefix: | asnd_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2025-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2025-en-r&anchor=para_47_b&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_WeightedAverageFairValueAtMeasurementDateOtherEquityInstrumentsGranted
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | asnd_ShareBasedPaymentArrangementAwardTypeAxis=asnd_RestrictedStockUnitsAndPerformanceStockUnitMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |