Segment reporting - Major distributor or whole sellers (Details)	6 Months Ended
Jun. 30, 2024 customer item	Jun. 30, 2023
Segment reporting
Number of operating segments \| item	1
Number of major customers from U.S. \| customer	4
Percentage of product net sales from major customers from United States	88.00%	88.00%

An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

No definition available.

Name:	argx_IfrsNumberOfOperatingSegments
Namespace Prefix:	argx_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration