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Inventories - Schedule of Changes in Provision for Slow Moving and Obsolete Inventories (Details) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of Measuring inventories [Abstract] |  |  |
At January 1, | € (207,078) | € (175,222) |
Provisions | (32,774) | (48,260) | € (59,558)
Utilizations and releases | 30,302 | 22,515 |
Exchange differences and other changes | 12,300 | (6,111) |
At December 31, | € (197,250) | € (207,078) | € (175,222)

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- Definition Allowance Account For Obsolete Inventory + References No definition available. + Details
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Namespace Prefix: | zgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of measuring inventories. + References No definition available. + Details
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Balance Type: | na
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- Definition Exchange Differences And Other Increases (Decreases) In Allowance For Obsolete Inventory + References No definition available. + Details
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Namespace Prefix: | zgn_
Data Type: | xbrli:monetaryItemType
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- Definition Provision For Obsolete Inventory + References No definition available. + Details
Name: | zgn_ProvisionForObsoleteInventory
Namespace Prefix: | zgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Utilization, Allowance For Obsolete Inventory + References No definition available. + Details
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Namespace Prefix: | zgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration