Financial Instruments - Schedule of Derivative Assets and Liabilities (Details) - Derivative hedging instruments - Currency risk - JPY (¥) ¥ in Millions	Mar. 31, 2025	Mar. 31, 2024
Euro \| Forward exchange contracts, selling
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, liabilities	¥ (3,120)	¥ (9,663)
Euro \| Forward exchange contracts, buying
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	1,054	6,268
United States Dollar \| Forward exchange contracts, selling
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, liabilities	1,673	(2,618)
United States Dollar \| Forward exchange contracts, buying
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, assets	(1,693)
United States Dollar \| Cross currency interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, liabilities		95,368
Hedging instrument, assets	68,154
Contract amount \| Euro \| Forward exchange contracts, selling
Disclosure of detailed information about hedging instruments [line items]
Contract amount	1,178,796	710,301
Contract amount \| Euro \| Forward exchange contracts, buying
Disclosure of detailed information about hedging instruments [line items]
Contract amount	305,964	336,271
Contract amount \| United States Dollar \| Forward exchange contracts, selling
Disclosure of detailed information about hedging instruments [line items]
Contract amount	128,717	170,364
Contract amount \| United States Dollar \| Forward exchange contracts, buying
Disclosure of detailed information about hedging instruments [line items]
Contract amount	129,574
Contract amount \| United States Dollar \| Cross currency interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Contract amount	774,089	874,974
Contract amount to be settled in more than one year \| Euro \| Forward exchange contracts, selling
Disclosure of detailed information about hedging instruments [line items]
Contract amount	0	0
Contract amount to be settled in more than one year \| Euro \| Forward exchange contracts, buying
Disclosure of detailed information about hedging instruments [line items]
Contract amount	0	0
Contract amount to be settled in more than one year \| United States Dollar \| Forward exchange contracts, selling
Disclosure of detailed information about hedging instruments [line items]
Contract amount	0	0
Contract amount to be settled in more than one year \| United States Dollar \| Forward exchange contracts, buying
Disclosure of detailed information about hedging instruments [line items]
Contract amount	0
Contract amount to be settled in more than one year \| United States Dollar \| Cross currency interest rate swaps
Disclosure of detailed information about hedging instruments [line items]
Contract amount	¥ 774,089	¥ 874,974

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

The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 24A
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_HedgingInstrumentAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]]

+ References

+ Details

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

- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NotionalAmount
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	srt_CurrencyAxis=currency_EUR
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfHedgesAxis=ifrs-full_CashFlowHedgesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	srt_CurrencyAxis=currency_USD
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_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: