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Restricted net assets - Narrative (Details) € in Millions | Dec. 31, 2024 EUR (€)
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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 + References 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 + References 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