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Restricted net assets - Narrative (Details) € in Millions	Dec. 31, 2024 EUR (€)
Restricted net assets [Abstract]
Restricted net assets subsidiaries	€ 2,426
Percentage of restricted net assets over total consolidated net assets	25.00%

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- Definition

Percentage of restricted net assets over total consolidated net assets

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No definition available.

+ Details

Name:	fer_PercentageOfRestrictedNetAssetsOverTotalConsolidatedNetAssets
Namespace Prefix:	fer_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

Restricted net assets

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No definition available.

+ Details

Name:	fer_RestrictedNetAssetsAbstract
Namespace Prefix:	fer_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Restricted net assets subsidiaries

+ References

No definition available.

+ Details

Name:	fer_RestrictedNetAssetsSubsidiaries
Namespace Prefix:	fer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant