Financial Instruments - Schedule of Hedging Instruments Balances (Details) - JPY (¥) ¥ in Millions	Mar. 31, 2026	Mar. 31, 2025
Interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Reserve of cash flow hedges, continuing hedges	¥ 1,215	¥ 1,010
Forward interest rate contracts
Disclosure of detailed information about hedging instruments [line items]
Reserve of cash flow hedges, continuing hedges	(13,323)	(15,795)
Cross currency interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Reserve of exchange differences on translation, continuing hedges	(27,354)	(53,627)
Balance in hedge cost reserve	(4,808)	(7,967)
Hedge related to acquisition
Disclosure of detailed information about hedging instruments [line items]
Reserve of exchange differences on translation, continuing hedges	3,560	3,560
Foreign currency denominated bonds and loans
Disclosure of detailed information about hedging instruments [line items]
Reserve of exchange differences on translation, continuing hedges		324,759
Foreign currency denominated bonds
Disclosure of detailed information about hedging instruments [line items]
Reserve of exchange differences on translation, continuing hedges	463,091
Forward exchange contracts
Disclosure of detailed information about hedging instruments [line items]
Reserve of exchange differences on translation, continuing hedges	¥ 228,060	¥ 203,262

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

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 24B
-Subparagraph b
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_24B_b_ii&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ReserveOfCashFlowHedgesContinuingHedges
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

A component of equity representing the reserve of exchange differences on translation in relation to continuing hedges. [Refer: Reserve of exchange differences on translation]

+ References

+ Details

Name:	ifrs-full_ReserveOfExchangeDifferencesOnTranslationContinuingHedges
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Balance In Hedge Cost Of Exchange Differences On Translation, Continuing Hedges

+ References

No definition available.

+ Details

Name:	tak_BalanceInHedgeCostOfExchangeDifferencesOnTranslationContinuingHedges
Namespace Prefix:	tak_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=ifrs-full_InterestRateSwapContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=ifrs-full_ForwardContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=tak_CrossCurrencyInterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=ifrs-full_CurrencySwapContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=tak_ForeignCurrencyDenominatedBondsAndLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=tak_ForeignCurrencyDenominatedBondsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=tak_ForwardExchangeContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: