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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

X

- 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

X

- 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

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

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

X

- Details

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

X

- Details

Name:	asnd_AntidilutiveSecuritiesNotIncludedInDilutedEarningsPerShareAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: