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Inventories - Schedule of Changes in Provision for Slow Moving and Obsolete Inventories (Details) - EUR (€) € in Thousands	12 Months Ended
	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

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No definition available.

+ Details

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Namespace Prefix:	zgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Disclosure of measuring inventories.

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No definition available.

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Name:	zgn_DisclosureOfMeasuringInventoriesAbstract
Namespace Prefix:	zgn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exchange Differences And Other Increases (Decreases) In Allowance For Obsolete Inventory

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No definition available.

+ Details

Name:	zgn_ExchangeDifferencesAndOtherIncreasesDecreasesInAllowanceForObsoleteInventory
Namespace Prefix:	zgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Provision For Obsolete Inventory

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No definition available.

+ Details

Name:	zgn_ProvisionForObsoleteInventory
Namespace Prefix:	zgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Utilization, Allowance For Obsolete Inventory

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No definition available.

+ Details

Name:	zgn_UtilizationAllowanceForObsoleteInventory
Namespace Prefix:	zgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration