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Significant Accounting Judgments and Estimates - Additional Information (Detail) € in Millions	Mar. 31, 2026 EUR (€)
Disclosure of changes in accounting estimates [line items]
Deferred tax assets recognized	€ 690.4

X

- Definition

Tax effect from deferred tax asset recognized.

+ References

No definition available.

+ Details

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Namespace Prefix:	asnd_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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_DisclosureOfChangesInAccountingEstimatesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration