The total cost of treasury cancelled during the period divided by the total number of shares cancelled.

No definition available.

Name:	fms_CancellationOfTreasurySharesAverageCostPerShare
Namespace Prefix:	fms_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of treasury stock that have been cancelled during the period.

+ References

No definition available.

+ Details

Name:	fms_CancellationOfTreasurySharesNumber
Namespace Prefix:	fms_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Difference between maximum value of shares that may yet be purchased and liability for such shares

+ References

No definition available.

+ Details

Name:	fms_DifferenceBetweenMaximumValueOfSharesThatMayYetBePurchasedAndLiabilityForSuchShares
Namespace Prefix:	fms_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Liability for shares yet to be repurchased

+ References

No definition available.

+ Details

Name:	fms_LiabilityForSharesYetToBeRepurchased
Namespace Prefix:	fms_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Payments to acquire or redeem entity's shares, including true-ups

+ References

No definition available.

+ Details

Name:	fms_PaymentsToAcquireOrRedeemEntitySSharesIncludingTrueUps
Namespace Prefix:	fms_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The total cost of shares repurchased divided by the total number of shares repurchased.

+ References

No definition available.

+ Details

Name:	fms_PurchaseOfTreasurySharesAverageCostPerShare
Namespace Prefix:	fms_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of repurchased shares.

+ References

No definition available.

+ Details

Name:	fms_PurchaseOfTreasuryStockShares
Namespace Prefix:	fms_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of tranches under share buy-back program

+ References

No definition available.

+ Details

Name:	fms_ShareBuyBackProgramNumberOfTranches
Namespace Prefix:	fms_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Share buyback program, percentage of share capital repurchased

+ References

No definition available.

+ Details

Name:	fms_ShareBuybackProgramPercentageOfShareCapitalRepurchased
Namespace Prefix:	fms_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Share buyback program, percentage of share capital to be repurchased

+ References

No definition available.

+ Details

Name:	fms_ShareBuybackProgramPercentageOfShareCapitalToBeRepurchased
Namespace Prefix:	fms_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The total cost of treasury stock divided by the total number of shares held in treasury.

+ References

No definition available.

+ Details

Name:	fms_TreasurySharesAverageCostPerShare
Namespace Prefix:	fms_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of treasury stock cancelled during the period. [Refer: Treasury shares]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 106
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_106_d&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_CancellationOfTreasuryShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Total for all associates [member]; Total for all subsidiaries [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 160
-Subparagraph a
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_160_a_vi&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph B10
-Subparagraph a
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_B10_a_vi&doctype=Appendix&subtype=B
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2027-01-01
-Name IAS
-Number 1
-IssueDate 2025-01-01
-Paragraph 79
-Subparagraph a
-Clause vi
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_79_a_vi&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_SharesInEntityHeldByEntityOrByItsSubsidiariesOrAssociates
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	srt_ShareRepurchaseProgramLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

+ Details

Name:	srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix:	srt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_IssuedCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_AdditionalPaidinCapitalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ComponentsOfEquityAxis=ifrs-full_TreasurySharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=fms_ShareBuyBackProgramsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=fms_ShareBuyBackProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=fms_ShareBuyBackProgramTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=fms_ShareBuyBackProgramTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=fms_NewShareBuyBackProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ShareRepurchaseProgramAxis=fms_NewShareBuyBackProgramTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Notes to the consolidated statements of income - Share buyback program (Details) € / shares in Units, € in Thousands	1 Months Ended														4 Months Ended	5 Months Ended	9 Months Ended			14 Months Ended
	Sep. 30, 2026 EUR (€) € / shares shares	Aug. 31, 2026 EUR (€) € / shares shares	Jul. 31, 2026 EUR (€) € / shares shares	Jun. 30, 2026 EUR (€) € / shares shares	May 31, 2026 EUR (€) € / shares shares	Apr. 30, 2026 € / shares shares	Mar. 31, 2026 EUR (€) € / shares shares	Feb. 28, 2026 EUR (€) € / shares shares	Jan. 31, 2026 EUR (€) € / shares shares	Dec. 31, 2025 € / shares shares	Nov. 30, 2025 EUR (€) € / shares shares	Oct. 31, 2025 EUR (€) € / shares shares	Sep. 30, 2025 EUR (€) € / shares shares	Aug. 31, 2025 EUR (€) € / shares shares	Sep. 30, 2026 EUR (€) € / shares shares	Dec. 29, 2025 EUR (€) shares	Sep. 30, 2026 EUR (€) € / shares shares	Apr. 30, 2026 shares	Sep. 30, 2025 EUR (€) shares	Sep. 30, 2026 EUR (€) € / shares shares	May 28, 2026 EUR (€)	May 21, 2026 EUR (€)	Jan. 09, 2026 EUR (€)	Aug. 11, 2025 EUR (€)	May 20, 2021 EUR (€) tranche
Share buyback program
Number of shares repurchased \| shares	2,216,227	3,205,260	1,178,833	2,299,945	155,000	1,523,855	3,705,233	2,596,794	2,898,373	5,607,549	4,164,232	788,260	1,479,790	2,084,733						33,904,084
Average weighted stock price per repurchased share \| € / shares	€ 38.92	€ 40.84	€ 41.86	€ 39.49	€ 37.15	€ 38.67	€ 38.72	€ 39.67	€ 37.29	€ 40.26	€ 41.1	€ 46.38	€ 42.45	€ 42.68						€ 40.17
Number of shares cancelled \| shares																				24,848,819
Average price per cancelled share \| € / shares																				€ 40.19
Number of treasury shares held \| shares	9,055,265														9,055,265		9,055,265			9,055,265
Average price per share held \| € / shares	€ 40.1														€ 40.1		€ 40.1			€ 40.1
Ordinary shares
Share buyback program
Number of shares cancelled \| shares																	(24,848,819)
Value of shares cancelled \| €																	€ (24,849)
Additional paid-in capital
Share buyback program
Value of shares cancelled \| €																	€ (974,778)
Treasury Stock
Share buyback program
Number of shares repurchased \| shares																	19,779,520		3,564,523
Number of shares cancelled \| shares																	24,848,819
Value of shares cancelled \| €																	€ 999,627
Share BuyBack Programs
Share buyback program
Number of shares repurchased \| shares																				33,904,084
Share buyback program value \| €	€ 236,894														€ 236,894		€ 236,894			€ 236,894
Number of shares cancelled \| shares																				24,848,819
Number of treasury shares held \| shares	9,055,265														9,055,265		9,055,265			9,055,265
2025 Share BuyBack Program
Share buyback program
Number of shares repurchased \| shares																		24,848,819
Percentage of share capital repurchased																		8.50%
Share buyback program value \| €																									€ 1,000,000
Share buyback program, number of tranches \| tranche																									2
2025 Share BuyBack Program \| Ordinary shares
Share buyback program
Value of shares cancelled \| €																	€ (24,848)
2025 Share BuyBack Program \| Additional paid-in capital
Share buyback program
Value of shares cancelled \| €																	€ (974,778)
2025 Share BuyBack Program \| Treasury Stock
Share buyback program
Number of shares cancelled \| shares																	24,848,819
2025 Share Buyback Program, first tranche
Share buyback program
Number of shares repurchased \| shares										5,607,549	4,164,232	788,260	1,479,790	2,084,733		14,124,564
Share buyback program value \| €											€ 240,485	€ 411,651	€ 448,210	€ 511,021					€ 448,210					€ 600,000
Amount of shares repurchased \| €																€ 586,450
2025 Share Buyback Program, second tranche
Share buyback program
Number of shares repurchased \| shares						1,523,855	3,705,233	2,596,794	2,898,373
Share buyback program value \| €							€ 58,973	€ 202,449	€ 305,474														€ 413,550
2026 Share Buyback Program
Share buyback program
Share buyback program value \| €																						€ 1,000,000
Share buyback program, percentage of share capital authorized to be repurchased																						10.00%
2026 Share Buyback Program, first tranche
Share buyback program
Number of shares repurchased \| shares	2,216,227	3,205,260	1,178,833	2,299,945	155,000										9,055,265
Share buyback program value \| €	€ 236,894	€ 323,153	€ 454,065	€ 503,409	€ 594,242										€ 236,894		€ 236,894			€ 236,894	€ 600,000
Liability related to shares yet to be repurchased \| €	238,507														238,507		238,507			238,507
Difference between maximum value of shares that may yet be purchased and liability for such shares \| €	€ 1,613														€ 1,613		€ 1,613			€ 1,613