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v3.26.1

Property, plant and equipment - Schedule of Impairment Testing to Reasonably Possible Changes in Assumptions (Details) - EUR (€) € in Millions | 12 Months Ended
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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%

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