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Related party- Narrative (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Related party transactions [abstract] |  |  |
The construction division recognized sales for construction work provided to operating groups | € 303,050 | € 489,259 | € 1,030,639
Billing from construction division to groups infrastructure concession operator | 206,077 | 375,680 | 865,487
Profit attributable to the companys holdings in the concession operators and not eliminated on consolidation | € (14,206) | € (34,942) | € (60,507)

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- Definition Billing from construction division to groups infrastructure concession operator + References No definition available. + Details
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Balance Type: | credit
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- Definition Profit attributable to the companys holdings in the concession operators and not eliminated on consolidation + References No definition available. + Details
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- Definition The construction division recognized sales for construction work provided to operating groups + References No definition available. + Details
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Namespace Prefix: | fer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ifrs-full_RelatedPartyTransactionsAbstract
Namespace Prefix: | ifrs-full_
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Period Type: | duration