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Revenue - Additional Information (Detail)	Mar. 31, 2026 Country
Bottom of range [member]
Disclosure of performance obligations [line items]
Number of countries covering agreements	75

X

- Definition

Number of countries covering agreements.

+ References

No definition available.

+ Details

Name:	asnd_NumberOfCountriesCoveringAgreements
Namespace Prefix:	asnd_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: