Trade and other receivables and other current assets (Details) - EUR (€) € in Thousands	Dec. 31, 2025	Dec. 31, 2024
Trade and other receivables and other current assets
Trade receivables	€ 9,568	€ 32,471
Current Contingent Consideration Receivable	6,955	4,742
Prepayments	103	103
Other receivables	4,080	10,160
Trade and other receivables	20,706	47,476
Accrued income	1,392	835
Deferred Charges	5,610	30,214
Other current assets	7,002	31,049
Total trade and other receivables & other current assets	€ 27,708	€ 78,525

The amount of current contingent consideration receivable.

No definition available.

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Balance Type:	debit
Period Type:	instant

- Definition

Deferred charges are a prepaid expense that is treated as an asset on a balance sheet and is carried forward until it is actually used.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of trade payables and other payables and other current assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	glpg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Trade And Other Receivables And Other Current Assets [Abstract]

+ References

No definition available.

+ Details

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Namespace Prefix:	glpg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of current accrued income other than current contract assets. [Refer: Accrued income other than contract assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of current prepayments. [Refer: Prepayments]

+ References

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of current trade receivables. [Refer: Trade receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of current assets that the entity does not separately disclose in the same statement or note. [Refer: Current assets]

+ References

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of current other receivables. [Refer: Other receivables]

+ References

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of current trade receivables and current other receivables. [Refer: Current trade receivables; Other current receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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Balance Type:	debit
Period Type:	instant