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Property, plant and equipment - Schedule of Impairment Testing to Reasonably Possible Changes in Assumptions (Details) - EUR (€) € in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Zegna segment DOSs
Disclosure of information for cash-generating units [line items]
Headroom	€ (4,129)	€ (4,150)
Revenues CAGR (%) vs. current year	(7.00%)	6.70%
WACC +100 bps	(4,484,000,000)	(4,734,000,000)
Revenues -250 bps	(4,850,000,000)	(5,084,000,000)
Growth rate -50 bps	(4,186,000,000)	(4,262,000,000)
Zegna segment DOSs | Bottom of range
Disclosure of information for cash-generating units [line items]
Percentage of WACC rate	8.06%	8.05%
Growth rate (%)	1.50%	1.00%
Zegna segment DOSs | Top of range
Disclosure of information for cash-generating units [line items]
Percentage of WACC rate	14.31%	14.09%
Growth rate (%)	4.00%	4.00%
Thom Browne segment DOSs
Disclosure of information for cash-generating units [line items]
Headroom	€ (495)	€ (2,957)
Revenues CAGR (%) vs. current year	24.50%	11.10%
WACC +100 bps	605,000,000	3,032,000,000
Revenues -250 bps	(688,000,000)	(3,614,000,000)
Growth rate -50 bps	(513,000,000)	(2,969,000,000)
Thom Browne segment DOSs | Bottom of range
Disclosure of information for cash-generating units [line items]
Percentage of WACC rate	10.32%	10.66%
Growth rate (%)	2.00%	2.50%
Thom Browne segment DOSs | Top of range
Disclosure of information for cash-generating units [line items]
Percentage of WACC rate	14.15%	13.06%
Growth rate (%)	3.00%	3.00%
TFI Group
Disclosure of information for cash-generating units [line items]
Headroom	€ (10,415)	€ (4,089)
Revenues CAGR (%) vs. current year	12.10%	16.90%
WACC +100 bps	10,654,000,000	4,323,000,000
Revenues -250 bps	(11,438,000,000)	(4,620,000,000)
Growth rate -50 bps	(10,433,000,000)	(4,140,000,000)
TFI Group | Bottom of range
Disclosure of information for cash-generating units [line items]
Percentage of WACC rate	9.52%	8.45%
Growth rate (%)	2.00%	2.00%
TFI Group | Top of range
Disclosure of information for cash-generating units [line items]
Percentage of WACC rate	13.66%	13.14%
Growth rate (%)	3.00%	3.00%

X

- Definition

The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

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- Definition

Difference between fair value and carrying value.

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- Definition

Increase decrease in the headroom due to percentage decrease in EBITDA.

+ References

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- Definition

Increase decrease in the headroom due to percentage increase in the weighted average cost of capital.

+ References

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